{"title":"Mercedes Exhaust Upgrades — Downpipes, Headers, X-Pipes \u0026 Cat-Backs","description":"\u003cstyle\u003e\n.collection-copy{--ink:#0b0f19;--sub:#4b5563;--line:#e5e7eb;--accent:#0ea5e9;--bg:#f8fafc;color:var(--ink);line-height:1.7;letter-spacing:.2px;font-size:16px}\n.collection-copy h2{font-size:clamp(20px,2.4vw,28px);font-weight:800;margin:0 0 .6rem}\n.collection-copy h3{font-size:17px;font-weight:900;margin:1.6rem 0 .4rem}\n.collection-copy p{margin:.7rem 0}\n.collection-copy .subtle{color:var(--sub)}\n.collection-copy hr{border:0;border-top:1px solid var(--line);margin:1.25rem 0}\n.collection-copy .pill-list{display:flex;flex-wrap:wrap;gap:.5rem;list-style:none;padding:0;margin:0}\n.collection-copy .pill-list li{background:var(--bg);border:1px solid var(--line);border-radius:999px;padding:.45rem .75rem;font-weight:700;font-size:14px}\n.collection-copy .two-col{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1rem 1.25rem;margin:1rem 0 0}\n.collection-copy .card{border:1px solid var(--line);border-radius:14px;padding:1rem 1.1rem;background:#fff}\n.collection-copy .card h3{margin:0 0 .35rem;font-size:16px;font-weight:900}\n.collection-copy a{color:var(--accent);font-weight:800;text-decoration:none}\n.collection-copy a:hover{text-decoration:underline}\n.collection-copy .note{border-left:4px solid var(--accent);background:#f6fbff;border-radius:14px;padding:1rem 1.1rem;margin:1.25rem 0 0}\n.collection-copy .warn{border-left:4px solid #b91c1c;background:#fdf5f5;border-radius:14px;padding:1rem 1.1rem;margin:1.25rem 0 0}\n\u003c\/style\u003e\n\u003cdiv class=\"collection-copy\"\u003e\n\u003cp class=\"subtle\"\u003eEverything that sits between the head and the tailpipe, across the whole Mercedes and AMG range — M112, M112K, M113, M113K, M133, M156, M157, M177, M178, M256, M270, M272, M273, M274, M276 and M278. Downpipes and headers for the turbo and NA platforms, X-pipes for the mid-section, and axle-back and cat-back systems where the goal is sound rather than flow.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eStart with whether the car has to pass inspection\u003c\/h3\u003e\n\u003cp class=\"subtle\"\u003eThis is the single question that decides which half of the collection you are shopping. It matters more than platform, budget or sound preference, because it is the one that cannot be undone cheaply.\u003c\/p\u003e\n\u003cp class=\"subtle\" style=\"font-size: 13px; margin-top: 1.25rem;\"\u003eNot sure which set fits, or whether a part keeps your converters? Send your year and model through \u003ca href=\"\/pages\/part-sourcing\"\u003epart sourcing\u003c\/a\u003e and we will confirm before you order.\u003c\/p\u003e\n\u003c\/div\u003e","products":[{"product_id":"mercedes-w205-c63-amg-m177-downpipes","title":"M177 Catless Downpipes for Mercedes-AMG C63 \u0026 C63S (W205) 2015–2023","description":"\u003cdiv style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif; color: #222; line-height: 1.75; max-width: 920px; margin: 0 auto; padding: 24px 20px;\"\u003e\n\u003cp style=\"font-size: 17px; color: #333; margin-bottom: 24px;\"\u003eThese high-flow catless downpipes for W205 C63 \/ C63S AMG replace the factory catalytic converters, a major bottleneck on the M177 V8 BiTurbo platform. TIG-welded 304 stainless, \u003cstrong\u003e3.0″ OD\u003c\/strong\u003e with a \u003cstrong\u003e2.0mm wall\u003c\/strong\u003e, running the full \u003cstrong\u003e3.0″\u003c\/strong\u003e diameter for nearly the entirety of the pipe rather than necking down after the flange. Once installed, you'll notice quicker turbo spool, sharper throttle response, and a much more aggressive AMG exhaust note. \u003cstrong\u003e590 WHP and 621 WTQ\u003c\/strong\u003e when paired with our M177 ECU tune. In US stock and shipped \u003cstrong\u003enext business day\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp style=\"background: #f8f8f8; padding: 14px 18px; border-radius: 10px; font-size: 15px; margin-bottom: 32px;\"\u003e\u003cstrong\u003eWant thermal shielding?\u003c\/strong\u003e Select \u003cstrong\u003eHeat Shielded\u003c\/strong\u003e in the selector above. High-temperature shielding cuts radiant heat coming off the pipe by up to \u003cstrong\u003e70–80%\u003c\/strong\u003e, holding under-hood temperatures down and protecting nearby wiring and sensors. It does not reduce backpressure — hotter gas in a fixed-diameter pipe carries a slightly higher frictional pressure drop. Worth it on a daily-driven or hot-climate car.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eReal Sound Demo\u003c\/h2\u003e\n\u003ciframe title=\"C63 AMG M177 Downpipes Sound\" src=\"https:\/\/www.youtube.com\/embed\/kio25a5RepQ\" style=\"max-width: 720px; border-radius: 10px; display: block; margin: 0 auto 24px;\" height=\"340\" width=\"100%\" loading=\"lazy\"\u003e\u003c\/iframe\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eDyno Results — 590 WHP \/ 621 WTQ with downpipes and tune\u003c\/h2\u003e\n\u003ciframe title=\"C63 AMG M177 Downpipes Dyno\" src=\"https:\/\/www.youtube.com\/embed\/WA-rbvsWAdM\" style=\"max-width: 720px; border-radius: 10px; display: block; margin: 0 auto 32px;\" height=\"340\" width=\"100%\" loading=\"lazy\"\u003e\u003c\/iframe\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Bolt-On\u003c\/strong\u003e — No cutting or fabrication required; installs in \u003cstrong\u003e2–3 hours\u003c\/strong\u003e. Professional installation is recommended\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTIG-Welded 304 Stainless Steel\u003c\/strong\u003e — Back-purged welds and machined flanges for leak-free, factory-spec connections. \u003cstrong\u003e3.0″ OD\u003c\/strong\u003e, \u003cstrong\u003e2.0mm wall\u003c\/strong\u003e, full \u003cstrong\u003e3.0″\u003c\/strong\u003e diameter for nearly the entirety of the pipe\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced Exhaust Backpressure\u003c\/strong\u003e — Allows the turbos to spool more efficiently and build boost faster under load\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStronger Mid-Range Torque\u003c\/strong\u003e — with a Stage 2 calibration, the flow these free up lands where you actually drive\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eWill downpipes alone add power?\u003c\/h2\u003e\n\u003cdiv style=\"border: 1px solid #e5e7eb; border-radius: 10px; padding: 20px 22px; margin-bottom: 20px; font-size: 15px; color: #333;\"\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eA little. Nothing like the numbers you'll see advertised.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eYour ECU targets a set boost level and holds it with the wastegate. Lower the backpressure and it doesn't raise that target — it just reaches the same number with the gate cracked further open. Fuel is metered to measured airmass to hold a target air-fuel ratio, so if airmass doesn't change, fuelling doesn't change, and neither does power. \u003cstrong\u003eYou don't make more power without burning more fuel, and the ECU decides how much fuel it burns.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThere are two places you do gain on a stock calibration. At the top of the pull the wastegate is already shut and the turbos are at their limit — there's no regulation left, so less restriction means genuinely more airflow and the ECU fuels it. And lower exhaust gas temperatures mean less timing pulled on a knock-limited engine. Together that's a handful of horsepower, mostly at high RPM.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eWhat you'll \u003cem\u003efeel\u003c\/em\u003e is much bigger than what you'll measure. Boost arrives sooner, so the car is quicker to respond and quicker between gears — which is why owners often report large gains from downpipes alone. That's turbo response, not output.\u003c\/p\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cstrong\u003eThe flow becomes power when the calibration does.\u003c\/strong\u003e A tune raises the boost target and fuels it. Any large figure quoted for \"downpipes alone\" was almost certainly measured on a tuned car — a real number with a misleading label.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #1a1a1a; color: #eaeaea; border-left: 4px solid #b30000; border-radius: 10px; padding: 22px 24px; margin-bottom: 20px;\"\u003e\n\u003ch2 style=\"font-size: 20px; margin: 0 0 12px; color: #fff;\"\u003eComplete the Stage 2 Build\u003c\/h2\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThese downpipes are the hardware half of a Stage 2 M177. \u003cstrong\u003eThe tune is what turns them loose\u003c\/strong\u003e — it lets the ECU take advantage of the extra flow, and it \u003cstrong\u003eclears the check-engine light\u003c\/strong\u003e the catless design will otherwise set.\u003c\/p\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003ca href=\"\/products\/m177-v8-biturbo-4-0l-custom-ecu-tuning-c63-glc63\" style=\"color: #ff6b6b; font-weight: bold;\"\u003eAdd the M177 custom ECU tune →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #e5e7eb; border-radius: 10px; padding: 20px 22px; margin-bottom: 36px;\"\u003e\n\u003ch3 style=\"margin: 0 0 12px; font-size: 17px;\"\u003eWhat Else Owners Add At The Same Time\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px; font-size: 15px; color: #444;\"\u003eDownpipes free up the exhaust side. These address the intake and heat side — worth doing together while the car is already on the lift.\u003c\/p\u003e\n\u003cul style=\"padding-left: 20px; line-height: 1.8; font-size: 15px; margin: 0;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake:\u003c\/strong\u003e \u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/c63-amg-c63s-intake-filter-spacer-kit-for-m177-4-0l-v8-biturbo\"\u003eintake filter spacer kit\u003c\/a\u003e, or the full \u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/c63-glc63-amg-3-intake-kit-m177-4-0l-v8-bi-turbo-c63s-glc63s\"\u003e3″ dual intake kit\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat:\u003c\/strong\u003e \u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/front-mount-auxiliary-heat-exchanger-bundle-i-w205-c63-amg-c63s\"\u003efront mount + auxiliary heat exchanger bundle\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBoost control:\u003c\/strong\u003e \u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/gfb-dv-diverter-valve-upgrade-mercedes-amg-c63-m177\"\u003eGFB DV+ diverter valve\u003c\/a\u003e or \u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/c63-c63s-amg-vta-adapters-m177-4-0l-v8-bi-turbo\"\u003eVTA \/ BOV adapters\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin: 14px 0 0; font-size: 14px; color: #555;\"\u003e\u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/collections\/c63-c63s-amg-w205-m177-upgrades\"\u003eBrowse the full C63 range →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eCompatibility\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin-bottom: 24px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #1a1a1a; color: #fff;\"\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eYears\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eModels\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eW205 Sedan\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2015–2021\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eC63 AMG, C63 S AMG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eC205 Coupe\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2016–2023\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eC63 AMG, C63 S AMG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eA205 Cabriolet\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2017–2023\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eC63 AMG, C63 S AMG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size: 15px; color: #444; margin-bottom: 36px;\"\u003eIf your car is on that list, these bolt straight on with no cutting or fabrication.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eWarranty, Shipping \u0026amp; Returns\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-month structural warranty\u003c\/strong\u003e — covers welds, flanges, and structural integrity under normal street use\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree U.S. shipping\u003c\/strong\u003e with tracking, shipped \u003cstrong\u003enext business day\u003c\/strong\u003e from US stock\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30-day returns\u003c\/strong\u003e — unused and in original packaging. \u003ca href=\"\/policies\/refund-policy\" style=\"color: #b30000; font-weight: 600;\"\u003eSee full return policy →\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin-bottom: 18px; color: #222;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDo these require a tune?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eThey fit and run fine on a stock car, and the sharper throttle response is immediate. The power arrives with the calibration. A tune is highly recommended for maximum performance and to clear fault codes.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill I get a check engine light?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eRemoving the catalytic converters will typically set a catalyst-efficiency code on an untuned car. A tune clears this properly — we do not recommend defeat devices.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eAre they catless?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes — fully catless. Intended for off-road, track, and racing use only.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill they fit my exact vehicle?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eThese fit the \u003cstrong\u003eW205 Sedan (2015–2021)\u003c\/strong\u003e, \u003cstrong\u003eC205 Coupe (2016–2023)\u003c\/strong\u003e, and \u003cstrong\u003eA205 Cabriolet (2017–2023)\u003c\/strong\u003e C63 and C63 S AMG with the M177 4.0L BiTurbo V8. If your car is on that list, it bolts straight on with no cutting or fabrication.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eHow long does installation take?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eProfessional shops typically complete the install in \u003cstrong\u003e2–3 hours\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cp style=\"margin-bottom: 36px;\"\u003e\u003ca href=\"mailto:benzunitedparts@gmail.com?subject=M177%20C63%20Downpipes%20Question\" style=\"color: #b30000; font-weight: 600;\"\u003eHave a question? Email us →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 36px; text-align: center;\"\u003e\u003cstrong\u003eOff road use only.\u003c\/strong\u003e Not legal for use on emissions-controlled vehicles or public roads.\u003c\/p\u003e\n\u003cdiv style=\"background: #1a1a1a; border-radius: 10px; padding: 12px 14px; margin-bottom: 20px; text-align: center; color: #eaeaea; font-size: 14px;\"\u003e🔧 \u003cstrong\u003eMercedes-AMG Specialists\u003c\/strong\u003e • 💬 \u003cstrong\u003eReal Enthusiast Support\u003c\/strong\u003e • 📦 \u003cstrong\u003eUS Stock\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Raw Stainless","offer_id":44398429896879,"sku":"BU-M177-DP-W205","price":595.0,"currency_code":"USD","in_stock":true},{"title":"Heat Shielded","offer_id":47384460296367,"sku":"BU-M177-DP-W205-HS","price":749.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/mercedes-c63-amg-w205-m177-downpipes-set-stainless-steel.jpg?v=1765559205"},{"product_id":"2015-2023-mercedes-c43-c450-c400-e43-e450-e400-exhaust-downpipes","title":"M276 Catless Downpipes – Mercedes-AMG C43 W205 \/ E43 W213 3.0L V6 BiTurbo","description":"\u003cdiv style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif; color: #222; line-height: 1.75; max-width: 920px; margin: 0 auto; padding: 24px 20px;\"\u003e\n\u003cp style=\"font-size: 17px; color: #333; margin-bottom: 24px;\"\u003eThese high-flow catless downpipes for the M276 3.0L BiTurbo V6 replace the factory catalytic converters, a major bottleneck on the C43 \/ E43 \/ E450 platform. Once installed, you'll notice quicker turbo spool, sharper throttle response, and a deeper, harder-edged note under load. \u003cstrong\u003eUp to 485 HP \/ 530 lb-ft\u003c\/strong\u003e when paired with our M276 ECU tune.\u003c\/p\u003e\n\u003cdiv style=\"background: #f8f8f8; padding: 16px 20px; border-radius: 10px; font-size: 15px; margin-bottom: 32px;\"\u003e\n\u003cul style=\"padding-left: 20px; margin: 0 0 12px; line-height: 1.8;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eRaw Stainless\u003c\/strong\u003e — untreated 304 stainless steel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCeramic Coated\u003c\/strong\u003e — a real reduction over raw stainless. Much lighter than heat shielding, and adds flex sections to absorb engine movement and thermal expansion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Shielded\u003c\/strong\u003e — cuts radiant heat by up to \u003cstrong\u003e80%\u003c\/strong\u003e, keeping under-hood temperatures down and protecting nearby engine bay components.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin: 0;\"\u003eSelect yours in the selector above.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eReal Sound Demo\u003c\/h2\u003e\n\u003ciframe title=\"Mercedes-AMG M276 Catless Downpipes Sound \u0026amp; Install\" src=\"https:\/\/www.youtube.com\/embed\/FdcHHSx1tCg\" style=\"max-width: 720px; border-radius: 10px; display: block; margin: 0 auto 32px;\" height=\"340\" width=\"100%\" loading=\"lazy\"\u003e\u003c\/iframe\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Bolt-On\u003c\/strong\u003e — No cutting or fabrication required; installs in \u003cstrong\u003e2–3 hours\u003c\/strong\u003e. Professional installation is recommended\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTIG-Welded 304 Stainless Steel\u003c\/strong\u003e — machined flanges for leak-free, factory-spec connections with \u003cstrong\u003e3.0″\u003c\/strong\u003e primary and \u003cstrong\u003e2.0mm\u003c\/strong\u003e wall thickness\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced Exhaust Backpressure\u003c\/strong\u003e — Allows the turbos to spool more efficiently and build boost faster under load\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFaster Boost Onset\u003c\/strong\u003e — less backpressure lets the turbos spool sooner, so the car responds quicker and pulls harder between gears. The power gain arrives with the tune\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"background: #1a1a1a; color: #eaeaea; border-left: 4px solid #b30000; border-radius: 10px; padding: 22px 24px; margin-bottom: 20px;\"\u003e\n\u003ch2 style=\"font-size: 20px; margin: 0 0 12px; color: #fff;\"\u003eComplete the Stage 2 Build\u003c\/h2\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003ePurchase our fully optimized M276 Stage 2 ECU tune to take advantage of the extra flow from catless downpipes and \u003cstrong\u003eclear the check-engine light\u003c\/strong\u003e the catless design will otherwise set.\u003c\/p\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003ca href=\"\/products\/m276-v6-biturbo-3-0l-custom-ecu-tuning-c43-c450-c400-e43-slc43-glc43\" style=\"color: #ff6b6b; font-weight: bold;\"\u003eAdd the M276 custom ECU tune →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eCompatibility\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin-bottom: 24px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #1a1a1a; color: #fff;\"\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eYears\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eModels\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eW205 Sedan\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003e2015\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eC400 4MATIC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eW205 Sedan\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003e2016\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eC450 AMG 4MATIC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eW205 Sedan\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003e2017–2021\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eC43 AMG 4MATIC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eC205 Coupé \/ A205 Cabriolet\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003e2017–2023\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eC43 AMG 4MATIC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eW213 \/ C238 \/ A238\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003e2017–2018\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eE43 AMG 4MATIC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eW213 \/ C238 \/ A238\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003e2017–2018\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eE400 4MATIC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eW213 \/ C238 \/ A238\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003e2019\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eE450 4MATIC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eWarranty, Shipping \u0026amp; Returns\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-month structural warranty\u003c\/strong\u003e — covers welds, flanges, and structural integrity under normal street use\u003c\/li\u003e\n\u003cli\u003eFree U.S. shipping with tracking, shipped \u003cstrong\u003enext business day\u003c\/strong\u003e from US stock\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30-day returns\u003c\/strong\u003e — unused and in original packaging. \u003ca href=\"\/policies\/refund-policy\" style=\"color: #b30000; font-weight: 600;\"\u003eSee full return policy →\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin-bottom: 18px; color: #222;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDo these require a tune?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eThey fit and run fine on a stock car, and the sharper throttle response is immediate. The power arrives with the calibration. A tune is highly recommended for maximum performance and to clear fault codes.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill I get a check engine light?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eRemoving the catalytic converters will typically set a catalyst-efficiency code on an untuned car. A tune clears this properly — we do not recommend defeat devices.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eAre they catless?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes — fully catless. Intended for off-road, track, and racing use only.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWhat is the difference between the three finishes?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eSame catless core, same \u003cstrong\u003e3.0″\u003c\/strong\u003e primary, identical flow on all three. What changes is radiant heat off the pipe. Raw Stainless is untreated 304. Heat Shielded cuts radiant heat by up to \u003cstrong\u003e70–80%\u003c\/strong\u003e, which keeps under-hood temperatures down and protects wiring and sensors routed near the exhaust. Ceramic Coated lands between the two — a real improvement over bare stainless but not as effective as full shielding — and adds flex sections at both ends to absorb engine movement and thermal expansion.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDo I need the O₂ sensor extension harness?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eOften, yes. A catless downpipe repositions the sensor bungs relative to the factory pipe, and the original leads may not reach comfortably. A 24″ extension avoids stretching or splicing the harness.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill they fit my exact vehicle?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eCheck the table above — it splits by model and year because Mercedes renamed this car twice. On the C-Class: C400 is \u003cstrong\u003e2015\u003c\/strong\u003e, C450 AMG is \u003cstrong\u003e2016\u003c\/strong\u003e, and C43 AMG is \u003cstrong\u003e2017–2021\u003c\/strong\u003e as a sedan and \u003cstrong\u003e2017–2023\u003c\/strong\u003e as a Coupé or Cabriolet. On the E-Class: E43 AMG and E400 are \u003cstrong\u003e2017–2018\u003c\/strong\u003e, E450 is \u003cstrong\u003e2019\u003c\/strong\u003e. These are built for the W205 \/ C205 \/ A205 and W213 \/ C238 \/ A238 chassis and nothing else — the 2023 and newer C43 Sedan is a W206 with a four-cylinder and is not covered.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eHow long does installation take?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eProfessional shops typically complete the install in \u003cstrong\u003e2–3 hours\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cp style=\"margin-bottom: 36px;\"\u003e\u003ca href=\"mailto:benzunitedparts@gmail.com?subject=M276%20Catless%20Downpipes%20Question\" style=\"color: #b30000; font-weight: 600;\"\u003eHave a question? Email us →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 36px; text-align: center;\"\u003e\u003cstrong\u003eOff road use only.\u003c\/strong\u003e Not legal for use on emissions-controlled vehicles or public roads.\u003c\/p\u003e\n\u003cdiv style=\"background: #1a1a1a; border-radius: 10px; padding: 12px 14px; margin-bottom: 20px; text-align: center; color: #eaeaea; font-size: 14px;\"\u003e🔧 \u003cstrong\u003eMercedes-AMG Specialists\u003c\/strong\u003e • 💬 \u003cstrong\u003eReal Enthusiast Support\u003c\/strong\u003e • 📦 \u003cstrong\u003eUS Stock\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Raw Stainless","offer_id":47159091003567,"sku":"BU-M276-DP-W205","price":495.0,"currency_code":"USD","in_stock":true},{"title":"Ceramic Coated","offer_id":47384460165295,"sku":"BU-M276-DP-W205-CC","price":595.0,"currency_code":"USD","in_stock":true},{"title":"Heat Shielded","offer_id":47159091036335,"sku":"BU-M276-DP-W205-HS","price":649.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/mercedes-amg-c43-m276-downpipes-set-stainless-steel.jpg?v=1773974528"},{"product_id":"c32-amg-shorty-headers-m112k","title":"Shorty Headers for Mercedes-Benz C32 AMG SLK32 – M112K V6 Kompressor","description":"\u003cdiv style=\"max-width:900px;margin:auto;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;color:#222;line-height:1.7;\"\u003e\n\u003cp style=\"font-size:18px;font-weight:600;text-align:center;\"\u003eReplace the restrictive factory manifolds on your C32 AMG — \u003cstrong\u003ewithout removing the catalytic converters.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-align:center;\"\u003ePrecision 304 stainless shorty headers built for the M112K supercharged V6. Short primaries keep exhaust velocity high, which sharpens throttle response and strengthens mid-range pull — while the factory cats stay in place and backpressure stays in the range the supercharged engine was calibrated for.\u003c\/p\u003e\n\n\u003cdiv style=\"border:1px solid #cfe3d4;background:#f2f9f4;border-radius:10px;padding:14px 16px;margin:26px 0;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:700;font-size:15px;\"\u003eEmissions tier: cat-compatible\u003c\/p\u003e\n\u003cp style=\"margin:0;font-size:14px;line-height:1.6;color:#33463a;\"\u003eThis header bolts to the factory catalytic converters and retains OEM-position oxygen sensors. No emissions equipment is removed or bypassed. We do not currently list a CARB Executive Order (EO) number for this part — California-registered vehicles require a CARB EO for aftermarket headers, so confirm your local requirements before ordering. Outside California, check your state’s inspection rules.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2 style=\"font-size:21px;margin:32px 0 14px;\"\u003eWhy C32 Owners Upgrade to These Headers\u003c\/h2\u003e\n\u003cul style=\"padding-left:22px;line-height:1.85;\"\u003e\n\u003cli\u003eNoticeably quicker throttle and stronger mid-range pull\u003c\/li\u003e\n\u003cli\u003eDeeper, more aggressive supercharged exhaust note\u003c\/li\u003e\n\u003cli\u003eKeeps the factory catalytic converters — no cat delete, no cutting, no welding\u003c\/li\u003e\n\u003cli\u003eOne-piece design with no leaky gaskets\u003c\/li\u003e\n\u003cli\u003e304 stainless steel — corrosion resistant and built to last\u003c\/li\u003e\n\u003cli\u003eDirect bolt-on replacement for factory manifolds 112-140-01-09 \u0026amp; 112-140-00-09\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv style=\"background:#f8f9fa;padding:18px;border-radius:10px;text-align:center;margin:28px 0;\"\u003e\n\u003cstrong\u003eFitment\u003c\/strong\u003e\u003cbr\u003e2002–2004 Mercedes-Benz C32 AMG (W203) — M112K supercharged 3.2L V6, direct fit.\u003cbr\u003e2002–2004 SLK32 AMG (R170) — same engine, modification required to fit.\n\u003c\/div\u003e\n\n\u003cdiv style=\"border:1px solid #e5e7eb;border-radius:10px;padding:14px 16px;margin:22px 0;background:#fafafa;\"\u003e\n\u003cp style=\"margin:0;font-size:15px;line-height:1.6;\"\u003e\u003cstrong\u003eDriving a C240, C320, CLK320 or E320?\u003c\/strong\u003e Those run the naturally aspirated M112 V6. We list that application separately, priced for it — see the \u003ca href=\"\/products\/shorty-headers-for-mercedes-c240-c320-clk320-e320-m112\"\u003eM112 V6 shorty headers\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp style=\"text-align:center;font-size:14px;color:#555;\"\u003eNot sure about your car? \u003ca href=\"\/pages\/contact\"\u003eSend us your VIN\u003c\/a\u003e and we’ll confirm fitment before you order.\u003c\/p\u003e\n\u003cp style=\"text-align:center;font-size:15px;color:#555;margin-top:30px;\"\u003eBenzUnited Parts • Quality Mercedes \u0026amp; AMG Performance Components\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":44503306338479,"sku":"BU-M112K-HDR-SHORTY","price":595.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/c32-amg-shorty-headers-m112k.jpg?v=1753894542"},{"product_id":"o2-sensor-extension-harness","title":"Ensure Accurate Readings with a 24″ O2 Sensor Extension Harness","description":"\u003ch2\u003e🔥 Keep Your Mercedes Performance Dialed In – 24″ O2 Sensor Extension Harness\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eUpgrading to long tube headers? Relocating your O2 sensors?\u003c\/strong\u003e Don’t risk check-engine lights or inaccurate readings. This \u003cstrong\u003ehigh-performance 24″ O2 Sensor Extension Harness\u003c\/strong\u003e gives you the extra reach you need—without sacrificing accuracy or reliability. Built for serious enthusiasts who demand OEM-level fit and race-proven durability.\u003c\/p\u003e\n\u003cp\u003ePerfect for performance exhaust upgrades, this harness extends your \u003cstrong\u003erear (post-cat) O2 sensor wiring\u003c\/strong\u003e by a full 24 inches, ensuring your emissions monitoring stays precise no matter where your sensors are mounted.\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003e🏁 Key Features \u0026amp; Benefits:\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e24″ Extension:\u003c\/strong\u003e Ideal for O2 sensor relocations—especially when installing long tube headers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Fits most 1996–2016 Mercedes-Benz E-Class, CLS-Class, S-Class, SL-Class, CL-Class, SLK-Class, C-Class, and CLK-Class models.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExclusion:\u003c\/strong\u003e Not compatible with G-Class models.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRear O2 Sensor Specific:\u003c\/strong\u003e Designed for post-cat oxygen sensors for accurate emissions readings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrack-Proven Durability:\u003c\/strong\u003e Heat- and abrasion-resistant construction built for extreme undercar conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlug \u0026amp; Play:\u003c\/strong\u003e Direct-fit connectors—no cutting, splicing, or wiring guesswork.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfidence Backed:\u003c\/strong\u003e 1-Year Replacement Warranty included.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e\u003cstrong\u003e⚙️ Installation Notes:\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eMost Mercedes models require \u003cstrong\u003etwo harnesses\u003c\/strong\u003e for the rear O2 sensors. Sold individually—order the correct quantity for your setup. Installation is quick: connect to your existing O2 sensor wiring, route securely, and \u003cstrong\u003ekeep away from hot exhaust components and moving parts\u003c\/strong\u003e for maximum lifespan.\u003c\/p\u003e\n\u003cp\u003eWhether you’re chasing horsepower or refining your custom exhaust setup, this O2 Sensor Extension Harness is the \u003cstrong\u003eno-compromise solution\u003c\/strong\u003e for keeping your emissions system happy while unlocking performance potential.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNOTE : most models will require trimming of the connector as the Part number for the connector is the same but the Design and drawing have different layouts trimming the connector is what we recommend to fit to your oem harness at this point in time.\u003c\/strong\u003e\u003c\/p\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":44503774658735,"sku":"BU-UNI-O2-EXT24","price":74.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/mercedes-o2-sensor-extension-harness-24-inch.jpg?v=1754612386"},{"product_id":"m178-catless-downpipes-mercedes-amg-gt-gts-gtr-gtc","title":"M178 Catless Downpipes – Mercedes-AMG GT \/ GT S \/ GT C \/ GT R (R190) 4.0L V8 BiTurbo","description":"\u003cdiv style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif; color: #222; line-height: 1.75; max-width: 920px; margin: 0 auto; padding: 24px 20px;\"\u003e\n\u003cp style=\"font-size: 17px; color: #333; margin-bottom: 24px;\"\u003eThese high-flow catless downpipes for the Mercedes-AMG GT replace the factory catalytic converters, a major bottleneck on the M178 4.0L V8 BiTurbo. TIG-welded 304 stainless, \u003cstrong\u003e3.0″ OD\u003c\/strong\u003e with a \u003cstrong\u003e2.0mm wall\u003c\/strong\u003e and \u003cstrong\u003e8.5mm\u003c\/strong\u003e high-temperature TIG welds at the flanges. Once installed, you'll notice quicker turbo spool, sharper throttle response, and a harder-edged AMG note under load. Direct bolt-on, no cutting. In US stock and shipped \u003cstrong\u003enext business day\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp style=\"background: #f8f8f8; padding: 14px 18px; border-radius: 10px; font-size: 15px; margin-bottom: 32px;\"\u003eThese fit the \u003cstrong\u003eR190\u003c\/strong\u003e AMG GT, the two-seat car built from \u003cstrong\u003e2015\u003c\/strong\u003e to \u003cstrong\u003e2021\u003c\/strong\u003e. Every variant is covered — base GT through Black Series, coupé and roadster alike.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eReal Sound Demo\u003c\/h2\u003e\n\u003ciframe title=\"AMG GT M178 Downpipes Sound\" src=\"https:\/\/www.youtube.com\/embed\/1RYF-yC9eH4\" style=\"max-width: 720px; border-radius: 10px; display: block; margin: 0 auto 32px;\" height=\"340\" width=\"100%\" loading=\"lazy\"\u003e\u003c\/iframe\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Bolt-On\u003c\/strong\u003e — No cutting or fabrication required; installs in \u003cstrong\u003e2–3 hours\u003c\/strong\u003e. Professional installation is recommended\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTIG-Welded 304 Stainless Steel\u003c\/strong\u003e — \u003cstrong\u003e8.5mm\u003c\/strong\u003e high-temperature TIG welds and machined flanges for leak-free, factory-spec connections. \u003cstrong\u003e3.0″ OD\u003c\/strong\u003e with a \u003cstrong\u003e2.0mm wall\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced Exhaust Backpressure\u003c\/strong\u003e — Allows the turbos to spool more efficiently and build boost faster under load\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStronger Mid-Range Torque\u003c\/strong\u003e — with a Stage 2 calibration, the flow these free up lands where you actually drive\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"background: #1a1a1a; color: #eaeaea; border-left: 4px solid #b30000; border-radius: 10px; padding: 22px 24px; margin-bottom: 32px;\"\u003e\n\u003ch2 style=\"font-size: 20px; margin: 0 0 12px; color: #fff;\"\u003eComplete the Stage 2 Build\u003c\/h2\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThese downpipes are the hardware half of a Stage 2 M178. \u003cstrong\u003eThe tune is what turns them loose\u003c\/strong\u003e — it lets the ECU take advantage of the extra flow, and it \u003cstrong\u003eclears the check-engine light\u003c\/strong\u003e the catless design will otherwise set.\u003c\/p\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003ca href=\"\/products\/mercedes-amg-gt-ecu-tune-m178\" style=\"color: #ff6b6b; font-weight: bold;\"\u003eAdd the M178 custom ECU tune →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eCompatibility\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin-bottom: 24px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #1a1a1a; color: #fff;\"\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eYears\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eModels\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eR190\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003e2015–2021\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eAMG GT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eR190\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003e2015–2021\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eAMG GT S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eR190\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003e2018–2021\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eAMG GT C, AMG GT C Roadster\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eR190\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003e2018–2021\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eAMG GT Roadster\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eR190\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003e2018–2021\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eAMG GT R, AMG GT R Pro\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eR190\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e\u003cstrong\u003e2021\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eAMG GT Black Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eWarranty, Shipping \u0026amp; Returns\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-month structural warranty\u003c\/strong\u003e — covers welds, flanges, and structural integrity under normal street use\u003c\/li\u003e\n\u003cli\u003e\nFree U.S. shipping with tracking, shipped \u003cstrong\u003enext business day\u003c\/strong\u003e from US stock\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30-day returns\u003c\/strong\u003e — unused and in original packaging. \u003ca href=\"\/policies\/refund-policy\" style=\"color: #b30000; font-weight: 600;\"\u003eSee full return policy →\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin-bottom: 18px; color: #222;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDo these require a tune?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eThey fit and run fine on a stock car, and the sharper throttle response is immediate. The power arrives with the calibration. A tune is highly recommended for maximum performance and to clear fault codes.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill I get a check engine light?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eLikely, on a stock car. Removing the cats means the downstream O₂ sensors read differently than the ECU expects. A tune clears this properly — we do not recommend defeat devices.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eAre they catless?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes — fully catless. Intended for off-road, track, and racing use only.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill they fit my exact vehicle?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eCheck the table above. These fit the \u003cstrong\u003eR190\u003c\/strong\u003e AMG GT — every variant of it, from the base GT through GT S, GT C, GT R, GT R Pro and Black Series, coupé and roadster, \u003cstrong\u003e2015\u003c\/strong\u003e to \u003cstrong\u003e2021\u003c\/strong\u003e. Fitment is decided by chassis, not by engine. If your car is on that list, it bolts straight on with no cutting or fabrication.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDoes the Black Series use the same downpipes?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes. The Black Series runs a different top end, but the chassis and the downpipe mounting are shared with the rest of the R190 range, so this set fits it.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eHow long does installation take?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eProfessional shops typically complete the install in \u003cstrong\u003e2–3 hours\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 32px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eIs there a warranty?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes — a \u003cstrong\u003e12-month\u003c\/strong\u003e structural warranty, with guaranteed fitment on every model listed above.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cp style=\"margin-bottom: 36px;\"\u003e\u003ca href=\"mailto:benzunitedparts@gmail.com?subject=M178%20AMG%20GT%20Downpipes%20Question\" style=\"color: #b30000; font-weight: 600;\"\u003eHave a question? Email us →\u003c\/a\u003e\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\"\u003eOff-road and race use only. Not legal for use on emissions-controlled vehicles or public roads. Buyer is responsible for compliance with local laws.\u003c\/div\u003e\n\u003cdiv style=\"background: #1a1a1a; border-radius: 10px; padding: 12px 14px; margin-top: 36px; margin-bottom: 20px; text-align: center; color: #eaeaea; font-size: 14px;\"\u003e🔧 \u003cstrong\u003eMercedes-AMG Specialists\u003c\/strong\u003e • 💬 \u003cstrong\u003eReal Enthusiast Support\u003c\/strong\u003e • 📦 \u003cstrong\u003eUS Stock\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":47333183979695,"sku":"BU-M178-DP-R190","price":795.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/mercedes-amg-gt-m178-downpipes-stainless-steel-set.jpg?v=1770023028"},{"product_id":"m177-catless-downpipes-amg-gt63-x290-e63-w213","title":"M177 Catless Downpipes for Mercedes-AMG GT 63 (X290) \u0026 E63 \/ E63S (W213) – 304 Stainless Steel","description":"\u003cdiv style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif; color: #222; line-height: 1.75; max-width: 920px; margin: 0 auto; padding: 24px 20px;\"\u003e\n\u003cp style=\"font-size: 17px; color: #333; margin-bottom: 24px;\"\u003eThese 304 stainless steel catless downpipes replace the restrictive factory catalytic converters on the M177 4.0L BiTurbo V8, fitting the AMG GT 63 and GT 63 S (X290) and the E63 and E63 S (W213). Once installed, you'll notice quicker turbo spool, sharper throttle response, and a considerably harder exhaust note. \u003cstrong\u003e3.0″ outer diameter, 1.5mm wall, 8.5mm high-temperature TIG welding\u003c\/strong\u003e — bolt-on V-band design, installed in \u003cstrong\u003e2–3 hours\u003c\/strong\u003e with no cutting.\u003c\/p\u003e\n\u003cp style=\"background: #f8f8f8; padding: 14px 18px; border-radius: 10px; font-size: 15px; margin-bottom: 32px;\"\u003e\u003cstrong\u003eWant thermal shielding?\u003c\/strong\u003e Select \u003cstrong\u003eHeat Shielded\u003c\/strong\u003e in the selector above. The shielding cuts radiant heat off the pipe by up to \u003cstrong\u003e80%\u003c\/strong\u003e, holding under-hood temperatures down and protecting wiring and sensors routed near the exhaust — worth it on a daily-driven or hot-climate car.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin-bottom: 18px; color: #1a1a1a;\"\u003eReal M177 Exhaust Sound\u003c\/h2\u003e\n\u003cp style=\"margin-bottom: 12px; font-weight: 600;\"\u003eWith tune + these downpipes\u003c\/p\u003e\n\u003ciframe title=\"M177 Catless Downpipes Sound - Tuned\" src=\"https:\/\/www.youtube.com\/embed\/Y9tOWsqLiL0\" style=\"max-width: 720px; border-radius: 10px; display: block; margin: 0 auto 24px;\" height=\"340\" width=\"100%\" loading=\"lazy\"\u003e\u003c\/iframe\u003e\n\u003cp style=\"margin-bottom: 12px; font-weight: 600;\"\u003eDownpipes only (stock tune)\u003c\/p\u003e\n\u003cvideo style=\"max-width: 720px; border-radius: 10px; display: block; margin: 0 auto 32px;\" controls=\"controls\" height=\"340\" width=\"100%\"\u003e\u003csource type=\"video\/mp4\" src=\"https:\/\/cdn.shopify.com\/videos\/c\/o\/v\/12a3c498ceb44af88a9367ac1c462995.mp4\"\u003eYour browser does not support the video tag.\u003c\/source\u003e\u003c\/video\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.0″ OD, 1.5mm Wall 304 Stainless\u003c\/strong\u003e — Diameter matched to what the M177 actually flows, keeping exhaust gas velocity high enough to protect mid-range response rather than chasing a bigger number on paper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8.5mm High-Temperature TIG Welding\u003c\/strong\u003e — Wide, fully penetrated weld beads at every joint, with machined flanges for leak-free factory fitment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBolt-on V-Band Design\u003c\/strong\u003e — Simple installation in \u003cstrong\u003e2–3 hours\u003c\/strong\u003e with no cutting or modifications required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced Exhaust Backpressure\u003c\/strong\u003e — Allows the turbos to spool more efficiently and build boost faster under load\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"background: #1a1a1a; color: #eaeaea; border-left: 4px solid #b30000; border-radius: 10px; padding: 22px 24px; margin-bottom: 32px;\"\u003e\n\u003ch2 style=\"font-size: 20px; margin: 0 0 12px; color: #fff;\"\u003eComplete the Stage 2 Build\u003c\/h2\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThese downpipes are the hardware half of a Stage 2 M177. \u003cstrong\u003eThe tune is what turns them loose\u003c\/strong\u003e — it lets the ECU take advantage of the extra flow, and it \u003cstrong\u003eclears the check-engine light\u003c\/strong\u003e the catless design will otherwise set.\u003c\/p\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003ca href=\"\/products\/ecu-tune-for-mercedes-e63-e63s-amg-w213-m177-4-0l-v8\" style=\"color: #ff6b6b; font-weight: bold;\"\u003eAdd the W213 \/ GT 63 custom ECU tune →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eCompatibility\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin-bottom: 24px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #1a1a1a; color: #fff;\"\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eYears\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eModels\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eX290\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2019–2023\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eAMG GT 63 4-Door Coupe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eX290\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2019–2023\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eAMG GT 63 S 4-Door Coupe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eW213\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2017–2023\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eE63 AMG S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eW213\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2016–2020\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eE63 AMG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eWarranty, Shipping \u0026amp; Returns\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-month structural warranty\u003c\/strong\u003e — covers welds, flanges, and structural integrity under normal street use\u003c\/li\u003e\n\u003cli\u003e\nFree U.S. shipping with tracking, shipped \u003cstrong\u003enext business day\u003c\/strong\u003e from US stock\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30-day returns\u003c\/strong\u003e — unused and in original packaging. \u003ca href=\"\/policies\/refund-policy\" style=\"color: #b30000; font-weight: 600;\"\u003eSee full return policy →\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin-bottom: 18px; color: #222;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDo these require a tune?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eThey'll run on a stock car, but a tune is strongly recommended — both to get the full benefit and to clear the fault codes that catless pipes typically set. There's a sound clip of both configurations above so you can hear the difference.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill I get a check engine light?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eLikely, on the stock tune. Removing the cats means the downstream O₂ sensors read differently than the ECU expects. A tune resolves it properly — we do not recommend defeat devices.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWhy 3.0″ and not larger?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eBigger is not automatically better. A downpipe sized past what the engine actually flows drops exhaust gas velocity, and velocity is what carries mid-range torque and turbo response. \u003cstrong\u003e3.0″\u003c\/strong\u003e is what the M177 wants to balance top-end flow against the mid-range you actually drive on.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eIs the heat shielding worth it?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eOn a daily-driven car or in a hot climate, yes. The shielding cuts radiant heat off the pipe by up to \u003cstrong\u003e80%\u003c\/strong\u003e, which holds under-hood temperatures down and protects wiring and sensors routed near the exhaust. On a dedicated track car with cooling already sorted, Raw Stainless is usually enough.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eAre these street legal?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eNo. These delete the primary catalytic converters. They hold no CARB Executive Order, are not 50-state legal, and are not legal to install on a vehicle registered or operated on public roads in the United States. They are sold for closed-course competition and off-road use only — see the emissions notice at the top of this page.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eHow do I know they fit my car?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eThese fit the M177 BiTurbo V8 in the \u003cstrong\u003eAMG GT 63 and GT 63 S (X290, 2019–2023)\u003c\/strong\u003e, \u003cstrong\u003eE63 AMG (W213, 2016–2020)\u003c\/strong\u003e, and \u003cstrong\u003eE63 AMG S (W213, 2017–2023)\u003c\/strong\u003e. Fitment is decided by chassis, not by engine code. If your car is on that list, it bolts straight on with no cutting.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eHow long does installation take?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003e\u003cstrong\u003e2–3 hours\u003c\/strong\u003e at a professional shop. It's a bolt-on V-band design — no cutting or modification required.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 32px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWhat's included?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eA pair of 304 stainless steel catless downpipes with machined flanges and V-band clamps.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cp style=\"margin-bottom: 36px;\"\u003e\u003ca href=\"mailto:benzunitedparts@gmail.com?subject=M177%20W213%20GT63%20Downpipes%20Question\" style=\"color: #b30000; font-weight: 600;\"\u003eHave a question? Email us →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 36px; text-align: center;\"\u003e\u003cstrong\u003eOff road use only.\u003c\/strong\u003e Not legal for use on emissions-controlled vehicles or public roads.\u003c\/p\u003e\n\u003cdiv style=\"background: #1a1a1a; border-radius: 10px; padding: 12px 14px; margin-bottom: 20px; text-align: center; color: #eaeaea; font-size: 14px;\"\u003e🔧 \u003cstrong\u003eMercedes-AMG Specialists\u003c\/strong\u003e • 💬 \u003cstrong\u003eReal Enthusiast Support\u003c\/strong\u003e • 📦 \u003cstrong\u003eUS Stock\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Raw Stainless","offer_id":47166601003183,"sku":"BU-M177-DP-W213","price":649.0,"currency_code":"USD","in_stock":true},{"title":"Heat Shielded","offer_id":47166601035951,"sku":"BU-M177-DP-W213-HS","price":749.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/w213-e63s-amg-catless-downpipes.png?v=1770253954"},{"product_id":"cla45-a45-gla45-downpipe-45amg-m133","title":"M133 Catless Downpipe for Mercedes CLA45 \/ GLA45 AMG (2014–2019)","description":"\u003cdiv style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif; color: #222; line-height: 1.75; max-width: 920px; margin: 0 auto; padding: 24px 20px;\"\u003e\n\u003cp style=\"font-size: 17px; color: #333; margin-bottom: 24px;\"\u003eThe factory downpipe is a major restriction on the \u003cstrong\u003eMercedes CLA45 AMG (C117) and GLA45 AMG (X156)\u003c\/strong\u003e with the M133 2.0L turbo. This high-flow catless downpipe removes that bottleneck for noticeably quicker turbo spool, stronger mid-range torque, sharper throttle response and a much more aggressive exhaust note. Make up to \u003cstrong\u003e+55 whp and +84 wtq\u003c\/strong\u003e when you pair with our dyno proven Stage 2 ECU tune.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e304 Stainless,\u003c\/strong\u003e — \u003cstrong\u003eMandrel-Bent 3.5″ To 3.0″ \u003c\/strong\u003esize accelerates exhaust gas through the section, protecting mid-range torque and turbo response on the 2.0L M133.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8.5mm High-Tensile TIG Welding, CNC-Machined Flanges\u003c\/strong\u003e — the welded joints and flange faces are the two things that leak on a cheap downpipe. These are machined for OEM-style fitment and sealing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Flex Section\u003c\/strong\u003e — braided outer shield over an interlock liner, absorbing the movement a transversely mounted engine puts into the exhaust instead of passing it down the system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Bolt-On\u003c\/strong\u003e — OEM-style V-band with correctly positioned O₂ sensor bungs. No cutting or modification; professional installation is recommended\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eDyno Verified — 351 whp and 369 wtq on Stage 2\u003c\/h2\u003e\n\u003cp style=\"font-size: 16px; color: #444; margin-bottom: 32px;\"\u003eThe full dyno pull video and graph are in the gallery above. Running this downpipe with our Stage 2 ECU tune, the car measured \u003cstrong\u003e351 whp and 369 wtq\u003c\/strong\u003e at the wheels — a gain of \u003cstrong\u003e+55 whp and +84 wtq\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cdiv style=\"background: #1a1a1a; color: #eaeaea; border-left: 4px solid #b30000; border-radius: 10px; padding: 22px 24px; margin-bottom: 20px;\"\u003e\n\u003ch2 style=\"font-size: 20px; margin: 0 0 12px; color: #fff;\"\u003eComplete the Stage 2 Build\u003c\/h2\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThis downpipe is the hardware half of a Stage 2 M133. \u003cstrong\u003eThe tune is what turns it loose\u003c\/strong\u003e — it lets the ECU take advantage of the extra flow, and it \u003cstrong\u003eclears the check-engine light\u003c\/strong\u003e the catless design will otherwise set.\u003c\/p\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003ca href=\"\/products\/m133-ecu-tune-for-cla45-gla45-amg-higher-power-sharper-response\" style=\"color: #ff6b6b; font-weight: bold;\"\u003eAdd the M133 Stage 2 ECU tune →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eCompatibility\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin-bottom: 24px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #1a1a1a; color: #fff;\"\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eYears\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eModels\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eC117 Coupe\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2014–2019\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eCLA45 AMG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eX156 SUV\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2015–2019\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eGLA45 AMG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eWarranty, Shipping \u0026amp; Returns\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-month structural warranty\u003c\/strong\u003e — covers welds, flanges, and structural integrity under normal street use\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree U.S. shipping\u003c\/strong\u003e with tracking, shipped next business day from US stock\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30-day returns\u003c\/strong\u003e — unused and in original packaging. \u003ca href=\"\/policies\/refund-policy\" style=\"color: #b30000; font-weight: 600;\"\u003eSee full return policy →\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin-bottom: 18px; color: #222;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWhy 3.5″ tapering to 3.0″ on a 2.0L?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eA downpipe sized past what the engine actually flows drops exhaust gas velocity, and velocity is what carries mid-range torque and turbo response. Each downpipe is sized to the engine it fits rather than to one number applied across every platform. The taper here is deliberate — it takes the large turbine outlet and accelerates gas through the section instead of letting it stall in an oversized pipe.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill this throw a check engine light?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eIt can, yes. Running catless without ECU tuning will often trigger one. A tune clears it properly — we do not recommend defeat devices.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eIs it street legal?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eNo. It removes the factory catalytic converter, holds no CARB Executive Order, and is not legal to install on a vehicle registered or operated on public roads in the United States. Off-road and competition use only — see the emissions notice at the top of this page.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDo I need to cut or modify anything?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eNo cutting. It's a direct bolt-on using the OEM-style V-band, with CNC-machined flanges and correctly positioned O₂ sensor bungs. Professional installation is recommended.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDoes my car fit?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eCLA45 AMG 2014–2019 and GLA45 AMG 2015–2019 with the M133 engine. The engine code is what decides fitment on this platform.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 32px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eIs there a warranty?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes — a 12-month structural warranty, with guaranteed fitment on every model listed above.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cp style=\"margin-bottom: 36px;\"\u003e\u003ca href=\"mailto:benzunitedparts@gmail.com?subject=CLA45%20GLA45%20M133%20Downpipe%20Question\" style=\"color: #b30000; font-weight: 600;\"\u003eHave a question? Email us →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 36px; text-align: center;\"\u003e\u003cstrong\u003eOff-road Use Only. \u003c\/strong\u003eNot legal for use on emissions-controlled vehicles or public roads.\u003c\/p\u003e\n\u003cdiv style=\"background: #1a1a1a; border-radius: 10px; padding: 12px 14px; margin-bottom: 20px; text-align: center; color: #eaeaea; font-size: 14px;\"\u003e🔧 \u003cstrong\u003eMercedes-AMG Specialists\u003c\/strong\u003e • 💬 \u003cstrong\u003eReal Enthusiast Support\u003c\/strong\u003e • 📦 \u003cstrong\u003eUS Stock\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":44509816619183,"sku":"BU-M133-DP-CLA45","price":449.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/cla45-gla45-amg-m133-catless-downpipe-stainless.jpg?v=1772302488"},{"product_id":"mid-length-performance-headers","title":"Mid-Length Performance Headers for Mercedes M113K V8","description":"\u003cdiv style=\"font-family: Arial,sans-serif; max-width: 850px; margin: auto; padding: 20px; background-color: #f9f9f9; border: 1px solid #ddd; color: #333;\"\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.7;\"\u003eUnlock serious performance from your Mercedes V8 with these \u003cstrong\u003emid-length, high-flow performance headers\u003c\/strong\u003e for M113 and M113K engines. TIG-welded from stainless steel, these headers reduce backpressure, improve throttle response and help maintain strong boost while delivering the deep, aggressive exhaust note these AMG engines are known for.\u003c\/p\u003e\n\u003ch3 style=\"color: #003366;\"\u003eKey Features\u003c\/h3\u003e\n\u003cul style=\"font-size: 16px; line-height: 1.7;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Flow Design:\u003c\/strong\u003e reduces backpressure and improves exhaust flow on M113 and M113K V8 engines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignature Sound:\u003c\/strong\u003e produces a deep, raw AMG growl under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes Mid-Pipes:\u003c\/strong\u003e comes with mid-pipes (welding required for installation).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium Construction:\u003c\/strong\u003e TIG-welded stainless steel for strength and long-term durability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlobal Fitment:\u003c\/strong\u003e designed to work on both LHD and RHD vehicles.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"color: #003366;\"\u003eVehicle Compatibility\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 15px 0; font-size: 15px; background-color: #fff; border: 1px solid #ccc;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #003366; color: #fff;\"\u003e\n\u003cth style=\"padding: 10px; text-align: left; border: 1px solid #ccc;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 10px; text-align: left; border: 1px solid #ccc;\"\u003eEngine\u003c\/th\u003e\n\u003cth style=\"padding: 10px; text-align: left; border: 1px solid #ccc;\"\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003eE55 AMG (W211)\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003eM113K 5.4L supercharged V8\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003e2003–2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f8f8f8;\"\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003eCLS55 AMG (W219)\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003eM113K 5.4L supercharged V8\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003e2005–2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003eSL55 AMG (R230)\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003eM113K 5.4L supercharged V8\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003e2003–2008\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f8f8f8;\"\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003eCL55 AMG (W215)\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003eM113K 5.4L supercharged V8\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003e2003–2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003eS55 AMG (W220)\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003eM113K 5.4L supercharged V8\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003e2003–2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv style=\"border: 1px solid #e5e7eb; border-radius: 10px; padding: 14px 16px; margin: 22px 0; background: #fff;\"\u003e\n\u003cp style=\"margin: 0 0 6px; font-weight: bold; font-size: 15px;\"\u003eYou will likely need: O2 sensor extension harness\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 14px; line-height: 1.6;\"\u003eHeaders relocate the rear (post-cat) oxygen sensors away from the factory harness. Our \u003ca href=\"\/products\/o2-sensor-extension-harness\"\u003e24″ O2 sensor extension harness\u003c\/a\u003e covers the gap with no cutting or splicing. \u003cstrong\u003eMercedes V8s need two.\u003c\/strong\u003e Far cheaper to add now than to put the car back on the lift.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"color: #003366;\"\u003eWhy Upgrade?\u003c\/h3\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.7;\"\u003eThese mid-length headers are designed to improve exhaust flow on the M113 and M113K platform. The result is sharper throttle response, better exhaust scavenging under load and a more aggressive exhaust note.\u003c\/p\u003e\n\u003cp style=\"margin-top: 25px; font-size: 14px; color: #555; text-align: center;\"\u003e\u003cstrong\u003eOff road use only.\u003c\/strong\u003e Not legal for use on emissions-controlled vehicles or public roads.\u003c\/p\u003e\n\u003cp style=\"margin-top: 25px; font-size: 14px; color: #555; text-align: center;\"\u003eProfessional installation required. Ships within 1–2 business days.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":44509844177071,"sku":"BU-M113K-HDR-MID","price":795.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/m113k-mid-length-headers-main-kit.jpg?v=1786425846"},{"product_id":"e55-cls55-e500-cls500-amg-log-style-shorty-headers-m113-m113k","title":"M113K Shorty Log Style Headers – Mercedes E55 AMG CLS55 V8 Kompressor","description":"\u003cdiv class=\"rte\" style=\"max-width:980px;margin:0 auto;\"\u003e\n\u003cdiv style=\"border-radius:16px;padding:22px;background:linear-gradient(135deg,#0b0b0b,#1f1f1f);color:#fff;\"\u003e\n\u003cp style=\"margin:0 0 8px;font-weight:bold;letter-spacing:.4px;color:#d4af37;\"\u003eM113K Supercharged AMG • Retains Factory Cats\u003c\/p\u003e\n\u003ch2 style=\"margin:0;font-size:28px;line-height:1.15;font-weight:900;\"\u003eLog Style Shorty Headers for Mercedes-AMG M113K\u003c\/h2\u003e\n\u003cp style=\"margin:10px 0 0;color:#d1d5db;font-size:15px;\"\u003eFaster throttle response, stronger torque and improved exhaust flow — while retaining the factory catalytic converters and OEM-style O2 sensor placement.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"display:flex;flex-wrap:wrap;gap:10px;margin-top:14px;\"\u003e\n\u003cdiv style=\"flex:1;min-width:220px;background:#fff;border:1px solid #eee;border-radius:14px;padding:14px;\"\u003e\n\u003cstrong\u003eCat-Compatible\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#6b7280;\"\u003eRetains OEM catalytic converters\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1;min-width:220px;background:#fff;border:1px solid #eee;border-radius:14px;padding:14px;\"\u003e\n\u003cstrong\u003eNo-CEL Design\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#6b7280;\"\u003eOEM-style O2 sensor placement\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1;min-width:220px;background:#fff;border:1px solid #eee;border-radius:14px;padding:14px;\"\u003e\n\u003cstrong\u003eComplete Kit\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#6b7280;\"\u003eGaskets + studs included\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"border:1px solid #cfe3d4;background:#f2f9f4;border-radius:10px;padding:14px 16px;margin:26px 0;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:700;font-size:15px;\"\u003eEmissions tier: cat-compatible\u003c\/p\u003e\n\u003cp style=\"margin:0;font-size:14px;line-height:1.6;color:#33463a;\"\u003eThis header bolts to the factory catalytic converters and retains OEM-position oxygen sensors. No emissions equipment is removed or bypassed. We do not currently list a CARB Executive Order (EO) number for this part — California-registered vehicles require a CARB EO for aftermarket headers, so confirm your local requirements before ordering. Outside California, check your state’s inspection rules.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#fff;border:1px solid #eee;border-radius:16px;padding:18px;\"\u003e\n\u003cp style=\"margin:0;\"\u003eThese \u003cstrong\u003eM113K shorty headers\u003c\/strong\u003e are built for supercharged AMG owners who want real drivability gains without the headaches. Expect a more responsive pedal, better low-to-mid pull, and a cleaner exhaust path that complements stock or tuned setups.\u003c\/p\u003e\n\u003cp style=\"margin:10px 0 0;\"\u003ePair them with a \u003ca href=\"\/products\/m113k-ecu-tuning-e55-amg-cls55-sl55-s55-v8-kompressor-upgrade\"\u003ecustom M113K ECU tune\u003c\/a\u003e to maximise airflow and calibration for the supercharged 5.4L.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-top:14px;background:#fff;border:1px solid #eee;border-radius:16px;padding:18px;\"\u003e\n\u003ch2 style=\"margin:0 0 10px;font-size:20px;font-weight:900;\"\u003ePerformance Benefits\u003c\/h2\u003e\n\u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;\"\u003e\n\u003cdiv style=\"border:1px solid #f1f1f1;border-radius:14px;padding:14px;background:#fafafa;\"\u003e\n\u003cstrong\u003eStronger Torque Curve\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#6b7280;\"\u003eMore usable pull in normal driving and roll racing\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #f1f1f1;border-radius:14px;padding:14px;background:#fafafa;\"\u003e\n\u003cstrong\u003eSharper Throttle Response\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#6b7280;\"\u003eImproved exhaust efficiency helps the blower feel more immediate\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #f1f1f1;border-radius:14px;padding:14px;background:#fafafa;\"\u003e\n\u003cstrong\u003eCat \u0026amp; O2 Friendly\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#6b7280;\"\u003eDesigned to work with OEM cats and O2 placement\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #f1f1f1;border-radius:14px;padding:14px;background:#fafafa;\"\u003e\n\u003cstrong\u003eBuilt to Last\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#6b7280;\"\u003e304 stainless with thick .38\" flanges for sealing\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-top:14px;background:#fff;border:1px solid #eee;border-radius:16px;padding:18px;\"\u003e\n\u003ch2 style=\"margin:0 0 10px;font-size:20px;font-weight:900;\"\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul style=\"margin:0;padding-left:18px;\"\u003e\n\u003cli\u003eLeft \u0026amp; right M113K shorty headers\u003c\/li\u003e\n\u003cli\u003eGaskets and studs for installation\u003c\/li\u003e\n\u003cli\u003eHardware required for a complete install\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-top:14px;background:#fff;border:1px solid #eee;border-radius:16px;padding:18px;\"\u003e\n\u003ch2 style=\"margin:0 0 10px;font-size:20px;font-weight:900;\"\u003eVehicle Compatibility (M113K Supercharged)\u003c\/h2\u003e\n\u003cul style=\"margin:0;padding-left:18px;line-height:1.75;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e2003–2006\u003c\/strong\u003e Mercedes-Benz \u003cstrong\u003eE55 AMG\u003c\/strong\u003e (W211)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2005–2006\u003c\/strong\u003e Mercedes-Benz \u003cstrong\u003eCLS55 AMG\u003c\/strong\u003e (W219)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin:10px 0 0;font-size:13px;color:#6b7280;\"\u003eNot sure about fitment? Message us with your VIN and we’ll confirm.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-top:14px;background:#fff;border:1px solid #eee;border-radius:16px;padding:18px;\"\u003e\n\u003ch2 style=\"margin:0 0 10px;font-size:20px;font-weight:900;\"\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul style=\"margin:0;padding-left:18px;\"\u003e\n\u003cli\u003eDirect bolt-on for the listed M113K AMG applications\u003c\/li\u003e\n\u003cli\u003eInterfaces with factory mid-pipes and catalytic converters\u003c\/li\u003e\n\u003cli\u003eNo cutting or welding required\u003c\/li\u003e\n\u003cli\u003eProfessional install recommended\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-top:14px;border-radius:16px;padding:18px;border:1px solid #f3e3c0;background:#fff7e6;\"\u003e\n\u003cp style=\"margin:0;\"\u003e\u003cstrong\u003eBundle Offer:\u003c\/strong\u003e Get \u003cstrong\u003e25% off a custom M113K ECU tune\u003c\/strong\u003e when purchased with these headers. \u003ca href=\"\/pages\/contact\" style=\"font-weight:800;\"\u003eRequest bundle pricing →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-top:14px;background:#fff;border:1px solid #eee;border-radius:16px;padding:18px;\"\u003e\n\u003ch2 style=\"margin:0 0 10px;font-size:20px;font-weight:900;\"\u003eFAQ\u003c\/h2\u003e\n\u003cp style=\"margin:0 0 10px;\"\u003e\u003cstrong\u003eWill these trigger a CEL?\u003c\/strong\u003e\u003cbr\u003eDesigned to retain OEM-style O2 sensor placement to help avoid check engine lights.\u003c\/p\u003e\n\u003cp style=\"margin:0 0 10px;\"\u003e\u003cstrong\u003eDo I need to remove the catalytic converters?\u003c\/strong\u003e\u003cbr\u003eNo — these are built to work with the factory cats. If you want the catless route, see our \u003ca href=\"\/products\/mid-length-performance-headers\"\u003eM113K mid-length headers\u003c\/a\u003e instead, which are off-road use only.\u003c\/p\u003e\n\u003cp style=\"margin:0;\"\u003e\u003cstrong\u003eDo I need tuning?\u003c\/strong\u003e\u003cbr\u003eGains are noticeable on stock calibration; tuning is recommended to maximise results.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-top:16px;text-align:center;\"\u003e\n\u003ca href=\"\/collections\/mercedes-m113k-performance-upgrades\" style=\"display:inline-block;background:#111;color:#fff;padding:12px 22px;border-radius:12px;text-decoration:none;font-weight:900;margin:6px;\"\u003eShop More M113K Upgrades\u003c\/a\u003e \u003ca href=\"\/pages\/contact\" style=\"display:inline-block;background:#4b5563;color:#fff;padding:12px 22px;border-radius:12px;text-decoration:none;font-weight:900;margin:6px;\"\u003eRequest a Custom Setup\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":44509849190575,"sku":"BU-M113K-HDR-SHORTY","price":575.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/mercedes-m113k-log-style-shorty-headers.jpg?v=1755311800"},{"product_id":"e500-cls500-amg-long-tube-headers-m113","title":"Long Tube Headers for Mercedes E500 CLS500 – M113 5.0L V8 NA","description":"\u003cdiv style=\"font-family: Arial,sans-serif; line-height: 1.7; color: #222; background-color: #fafafa; border: 1px solid #ddd; border-radius: 10px; padding: 20px; max-width: 850px; margin: auto;\"\u003e\n\u003ch2 style=\"text-align: center; color: #555; font-weight: normal; font-size: 18px;\"\u003ePerformance Exhaust Upgrade • TIG-Welded 304 Stainless Steel\u003c\/h2\u003e\n\u003cp style=\"margin-top: 20px;\"\u003eReplace the restrictive factory manifolds on your M113-powered Mercedes with \u003cstrong\u003eBenzUnited Long Tube Headers\u003c\/strong\u003e. Longer primaries and a smooth collector improve exhaust scavenging, sharpening throttle response and shifting the power band toward the top end.\u003c\/p\u003e\n\u003ch3 style=\"color: #111; font-size: 20px; margin-top: 25px;\"\u003eKey Features \u0026amp; Specifications\u003c\/h3\u003e\n\u003cul style=\"margin-left: 20px; font-size: 15px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Flow Design:\u003c\/strong\u003e 1.9″ OD primaries and 2.9″ ID collectors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium Build:\u003c\/strong\u003e SUS-T304 stainless steel, dual TIG welds, 3\/8″ CNC flanges\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM-Grade Fitment:\u003c\/strong\u003e 4 O₂ bungs included for sensor integration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Kit:\u003c\/strong\u003e includes gaskets and hardware for a leak-free installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdaptability:\u003c\/strong\u003e weld-in midpipes required for non-AMG catback systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"color: #111; font-size: 20px; margin-top: 25px;\"\u003eCompatibility Chart\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin-top: 10px; font-size: 15px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #333; color: #fff;\"\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ccc;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ccc;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ccc;\"\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eMercedes-Benz E500 (5.0L RWD)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eW211\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2003–2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eMercedes-Benz CLS500 (5.0L RWD)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eW219\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2003–2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"margin-top: 14px; font-size: 14px; color: #555;\"\u003eThe E500 and CLS500 are not AMG cars — this header is for the \u003cstrong\u003eM113 5.0L naturally aspirated V8\u003c\/strong\u003e, not the supercharged M113K in the E55 \/ CLS55.\u003c\/p\u003e\n\u003cp style=\"margin-top: 12px; font-weight: bold; color: #b30000;\"\u003eFor non-AMG catback systems, welding is required to connect the included midpipes.\u003c\/p\u003e\n\u003cdiv style=\"border: 1px solid #e5e7eb; border-radius: 10px; padding: 16px 18px; margin: 26px 0; background: #fff;\"\u003e\n\u003ch3 style=\"margin: 0 0 10px; font-size: 17px;\"\u003eHow Our Three Header Styles Compare\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 14px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #f2f2f2;\"\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\"\u003e\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\"\u003eShorty\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\"\u003eMid-Length\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\"\u003eLong Tube\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003ePower bias\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eLow \u0026amp; mid-range\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eMid-range into top end\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eTop end\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eFactory cats\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eRetained\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eRemoved\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eRemoved\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eRoad legal\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eRetains emissions equipment\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eNo — off-road only\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eNo — off-road only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eInstall\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eBolt-on, no welding\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eWelding required\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eWelding usually required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003ePrice band\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eLowest\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eMiddle\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eHighest\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"margin: 10px 0 0; font-size: 14px;\"\u003eYou are viewing the \u003cstrong\u003elong tube\u003c\/strong\u003e — the most power, the most install work, and no cats. The \u003ca href=\"\/products\/m113-shorty-log-style-headers-mercedes-amg-e500-cls500\"\u003eshorty version for the same cars\u003c\/a\u003e keeps the cats and bolts on without welding.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #e5e7eb; border-radius: 10px; padding: 14px 16px; margin: 22px 0; background: #fff;\"\u003e\n\u003cp style=\"margin: 0 0 6px; font-weight: bold; font-size: 15px;\"\u003eYou will likely need: O2 sensor extension harness\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 14px; line-height: 1.6;\"\u003eLong tubes move the rear (post-cat) oxygen sensors well away from the factory harness. Our \u003ca href=\"\/products\/o2-sensor-extension-harness\"\u003e24″ O2 sensor extension harness\u003c\/a\u003e covers the gap with no cutting or splicing. \u003cstrong\u003eMost Mercedes V8s need two.\u003c\/strong\u003e Far cheaper to add now than to put the car back on the lift.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"color: #111; font-size: 20px; margin-top: 25px;\"\u003eRecommended Upgrades\u003c\/h3\u003e\n\u003cp\u003ePair these headers with our \u003ca style=\"color: #007bff; text-decoration: underline;\" href=\"\/products\/mercedes-m113-5-0l-ecu-tuning-e500-clk500-cls500-sl500\"\u003eCustom ECU Tune for the M113 5.0L\u003c\/a\u003e to recalibrate for the improved exhaust flow.\u003c\/p\u003e\n\u003ch3 style=\"color: #111; font-size: 20px; margin-top: 25px;\"\u003eWhy Choose BenzUnited Performance?\u003c\/h3\u003e\n\u003cul style=\"margin-left: 20px; font-size: 15px;\"\u003e\n\u003cli\u003eEngineered for M113 5.0L V8 platforms\u003c\/li\u003e\n\u003cli\u003eDirect fit with premium gaskets and hardware included\u003c\/li\u003e\n\u003cli\u003eU.S.-based support and fast shipping\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eOff road use only.\u003c\/strong\u003e Not legal for use on emissions-controlled vehicles or public roads.\u003c\/p\u003e\n\u003cdiv style=\"margin-top: 30px; text-align: center;\"\u003e\n\u003ca style=\"display: inline-block; background-color: #111; color: #fff; padding: 12px 25px; border-radius: 5px; text-decoration: none; font-weight: bold; margin: 5px 10px;\" href=\"\/collections\/mercedes-downpipes-tig-welded-304-stainless-steel-performance\"\u003eShop More Performance Parts\u003c\/a\u003e \u003ca style=\"display: inline-block; background-color: #555; color: #fff; padding: 12px 25px; border-radius: 5px; text-decoration: none; font-weight: bold; margin: 5px 10px;\" href=\"\/pages\/part-sourcing\"\u003eRequest Custom Setup\u003c\/a\u003e\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cfooter style=\"text-align: center; border-top: 1px solid #ccc; margin-top: 25px; padding-top: 10px; font-size: 13px; color: #555;\"\u003e\n\u003cp\u003e\u003cstrong\u003eBenzUnited Parts\u003c\/strong\u003e — Trusted Source for Mercedes M113 Performance Upgrades\u003c\/p\u003e\n\u003c\/footer\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":44509856694447,"sku":"BU-M113-HDR-LONG","price":1200.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/mercedes-e500-cls500-long-tube-headers-m113-performanceeaders-1.png?v=1760837826"},{"product_id":"clk550-e550-cls550-sl550-mid-length-performance-headers-m273-v8-na","title":"Mid-length Headers for Mercedes E550 CLK550 CLS550 SL550 M273 V8 NA","description":"\u003cp\u003eTransform your Mercedes-Benz M273 V8 with our \u003cstrong\u003ehigh-flow mid-length performance headers\u003c\/strong\u003e. Engineered to cut backpressure and maximise airflow, they free up horsepower and torque and give a deeper, more aggressive exhaust note. Fits the naturally aspirated M273 V8 in the E550, CLS550, SL550, CLK550, S550 and CL550.\u003c\/p\u003e\n\u003ch3\u003ePerformance Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-flow design:\u003c\/strong\u003e reduced exhaust restriction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced exhaust tone:\u003c\/strong\u003e deeper, throatier sound under throttle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimised piping:\u003c\/strong\u003e wide diameter balancing top-end power and torque.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlobal fitment:\u003c\/strong\u003e works with both LHD and RHD models.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-inch outlet pipe:\u003c\/strong\u003e large outlet for maximum flow and easy exhaust connection.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment Compatibility\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eEngine\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSL550\u003c\/td\u003e\n\u003ctd\u003eM273 V8\u003c\/td\u003e\n\u003ctd\u003e2007–2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCLS550\u003c\/td\u003e\n\u003ctd\u003eM273 V8\u003c\/td\u003e\n\u003ctd\u003e2007–2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCLK550\u003c\/td\u003e\n\u003ctd\u003eM273 V8\u003c\/td\u003e\n\u003ctd\u003e2007–2009\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eE550\u003c\/td\u003e\n\u003ctd\u003eM273 V8\u003c\/td\u003e\n\u003ctd\u003e2006–2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eS550\u003c\/td\u003e\n\u003ctd\u003eM273 V8\u003c\/td\u003e\n\u003ctd\u003e2007–2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCL550\u003c\/td\u003e\n\u003ctd\u003eM273 V8\u003c\/td\u003e\n\u003ctd\u003e2007–2010\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eChoose Your Option\u003c\/h3\u003e\n\u003cp\u003eUse the option selector above:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeaders only:\u003c\/strong\u003e the mid-length headers with mid-pipes, ready to install.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeaders + OEM gaskets \u0026amp; studs (+$180):\u003c\/strong\u003e we include fresh OEM exhaust gaskets and studs so you’re not chasing down hardware mid-install. If you’re doing this job once and doing it right, add the gasket set — reusing old gaskets on a header swap is a common source of leaks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eComplete the Build\u003c\/h3\u003e\n\u003cp\u003eHeaders are the single biggest breathing upgrade on the naturally aspirated M273 — but the factory ECU doesn’t know they’re there. A \u003cstrong\u003ecustom M273 tune adjusts timing and fuelling to the improved exhaust flow\u003c\/strong\u003e, recovering the rest of the power the headers make possible and sharpening throttle response.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/products\/custom-ecu-tune-for-mercedes-m273-v8-e550-cls550-cl550-s550-sl550\"\u003e\u003cstrong\u003eAdd a custom M273 ECU tune →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eWhile The Exhaust Is Off\u003c\/h3\u003e\n\u003cp\u003eHeader installation already has the exhaust apart and the car on a lift. These are the jobs worth doing in the same visit rather than paying the labour twice:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/o2-sensor-extension-harness\"\u003e\u003cstrong\u003e24″ O2 sensor extension harness\u003c\/strong\u003e\u003c\/a\u003e — headers move the rear (post-cat) oxygen sensors away from the factory harness. Plug-in extension, no splicing. \u003cstrong\u003eYou will need two.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/2-25-x-pipe-for-mercedes-na-replacement-for-secondary-cats\"\u003e\u003cstrong\u003eM273 X-Pipe\u003c\/strong\u003e\u003c\/a\u003e — replaces the restrictive secondary cats downstream of the headers. Headers and X-pipe together open the whole exhaust path instead of moving the restriction further back.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/k-n-33-2181-air-filter-set-mercedes-m273-v8-e550-cls550-s550-clk550\"\u003e\u003cstrong\u003eK\u0026amp;N 33-2181 high-flow air filters\u003c\/strong\u003e\u003c\/a\u003e — the M273 takes two. Freeing up the exhaust side without addressing the intake side leaves gains on the table.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/mercedes-m272-m273-intake-manifold-air-flap-adjuster-repair-kit\"\u003e\u003cstrong\u003eIntake manifold air flap repair kit\u003c\/strong\u003e\u003c\/a\u003e — fixes P2004 \/ P2005 \/ P2006. A very common M273 fault, and far easier to address while you are already under the hood.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eBuilding a full M273 setup? Send us your VIN and goals and we’ll map the smartest order.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eWhy Buy from BenzUnited\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTrusted by performance tuners and Mercedes enthusiasts.\u003c\/li\u003e\n\u003cli\u003eFast shipping, responsive support and fitment help.\u003c\/li\u003e\n\u003cli\u003eRare and high-performance Mercedes parts sourced with precision.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eBuy With Confidence\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree U.S. shipping\u003c\/strong\u003e with tracking on all orders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment confirmed before you buy:\u003c\/strong\u003e not sure it fits your exact car? Send us your VIN and we’ll verify before you order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMercedes specialists:\u003c\/strong\u003e we focus exclusively on Mercedes platforms — you’re working with people who know the M273 inside out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReal support:\u003c\/strong\u003e questions before or after purchase go straight to us, not a call center.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"mailto:benzunitedparts@gmail.com?subject=M273%20Headers%20Fitment%20Help\"\u003eConfirm fitment or ask a question →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eOff road use only.\u003c\/strong\u003e Not legal for use on emissions-controlled vehicles or public roads.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eProfessional installation with welding is required. Ships within 1–2 business days, packaged securely.\u003c\/em\u003e\u003c\/p\u003e","brand":"BenzUnited Parts","offers":[{"title":"Headers Only","offer_id":47103936168111,"sku":"HDR-M273-NOGASKET","price":949.0,"currency_code":"USD","in_stock":true},{"title":"With OEM Gaskets and Studs","offer_id":47103936200879,"sku":"HDR-M273-WITHGASKET","price":1129.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/mercedes-m273-performance-headers-e550-cls550-sl550.png?v=1756775561"},{"product_id":"m156-s-and-cl-long-tube-headers","title":"M156 Long Tube Headers – S63 \u0026 CL63 AMG (W221 \/ C216) Performance Upgrade","description":"\u003cdiv style=\"font-family: Arial,sans-serif; max-width: 850px; margin: auto; padding: 20px; background-color: #fafafa; border: 1px solid #ddd; color: #333;\"\u003e\n\u003ch2 style=\"color: #003366; text-align: center;\"\u003eM156 Long Tube Headers for S63 \u0026amp; CL63 AMG (W221 \/ C216)\u003c\/h2\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.7;\"\u003eUnleash your 6.2L AMG’s potential with our \u003cstrong\u003eM156 Long Tube Headers\u003c\/strong\u003e, engineered for airflow gains, improved scavenging and performance across the powerband. Built from \u003cstrong\u003eTIG-welded T-304 stainless steel\u003c\/strong\u003e, these headers are designed exclusively for the \u003cstrong\u003eW221 S63 AMG\u003c\/strong\u003e and \u003cstrong\u003eC216 CL63 AMG\u003c\/strong\u003e platforms.\u003c\/p\u003e\n\u003cdiv style=\"background-color: #eef3f8; padding: 15px; border-left: 4px solid #003366; margin: 20px 0;\"\u003e\n\u003cstrong\u003eDyno Proven:\u003c\/strong\u003e gains of \u003cstrong\u003e+39 WHP\u003c\/strong\u003e and \u003cstrong\u003e+34 lb-ft torque\u003c\/strong\u003e as a standalone upgrade. Sharper response, stronger midrange and harder top-end pull. Dyno chart included in the product images.\u003c\/div\u003e\n\u003ch3 style=\"color: #003366; font-size: 18px; margin-top: 20px;\"\u003eKey Features\u003c\/h3\u003e\n\u003cul style=\"font-size: 16px; line-height: 1.7; margin-left: 20px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e+39 WHP \/ +34 lb-ft\u003c\/strong\u003e confirmed through dyno testing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTIG-welded T-304 stainless steel\u003c\/strong\u003e for strength and heat resistance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong-tube design\u003c\/strong\u003e optimises velocity and scavenging efficiency\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMidsection X-pipe included\u003c\/strong\u003e for a complete high-flow system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision engineered\u003c\/strong\u003e for W221 S63 and C216 CL63 AMG M156 platforms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced exhaust tone\u003c\/strong\u003e — deeper, sharper AMG sound\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"color: #003366; font-size: 18px; margin-top: 25px;\"\u003eCompatibility\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin-top: 10px; font-size: 15px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eS63 AMG\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eW221\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2008–2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eCL63 AMG\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eC216\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2008–2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv style=\"border: 1px solid #e5e7eb; border-radius: 10px; padding: 16px 18px; margin: 26px 0; background: #fff;\"\u003e\n\u003ch3 style=\"margin: 0 0 10px; font-size: 17px; color: #003366;\"\u003eHow Our Three Header Styles Compare\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 14px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #f2f2f2;\"\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\"\u003e \u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\"\u003eShorty\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\"\u003eMid-Length\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\"\u003eLong Tube\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003ePower bias\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eLow \u0026amp; mid-range\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eMid-range into top end\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eTop end\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eFactory cats\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eRetained\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eRemoved\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eRemoved\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eRoad legal\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eRetains emissions equipment\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eNo — off-road only\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eNo — off-road only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eInstall\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eBolt-on, no welding\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eWelding required\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eWelding usually required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003ePrice band\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eLowest\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eMiddle\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eHighest\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"margin: 10px 0 0; font-size: 14px;\"\u003eThis is the \u003cstrong\u003eW221 \/ C216 long tube\u003c\/strong\u003e. The \u003ca href=\"https:\/\/benzunitedparts.com\/products\/63-amg-long-tube-headers-m156\"\u003eC63 \/ E63 \/ CLS63 version\u003c\/a\u003e is a different part. We do not currently offer a shorty header for the S63 \/ CL63 — browse \u003ca href=\"https:\/\/benzunitedparts.com\/collections\/m156-performance-parts-c63-e63-cls63-sl63-amg-upgrades\"\u003eall M156 parts\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #e5e7eb; border-radius: 10px; padding: 14px 16px; margin: 22px 0; background: #fff;\"\u003e\n\u003cp style=\"margin: 0 0 6px; font-weight: bold; font-size: 15px;\"\u003eYou will likely need: O2 sensor extension harness\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 14px; line-height: 1.6;\"\u003eLong tubes move the rear (post-cat) oxygen sensors well away from the factory harness. Our \u003ca href=\"\/products\/o2-sensor-extension-harness\"\u003e24″ O2 sensor extension harness\u003c\/a\u003e covers the gap with no cutting or splicing. \u003cstrong\u003eYou will need two.\u003c\/strong\u003e Far cheaper to add now than to put the car back on the lift.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"color: #003366; font-size: 18px; margin-top: 25px;\"\u003ePerformance Benefits\u003c\/h3\u003e\n\u003cul style=\"font-size: 16px; line-height: 1.7; margin-left: 20px;\"\u003e\n\u003cli\u003eIncreased exhaust flow and scavenging efficiency\u003c\/li\u003e\n\u003cli\u003eImproved throttle response and stronger midrange torque\u003c\/li\u003e\n\u003cli\u003eReduced backpressure for cooler, more efficient engine operation\u003c\/li\u003e\n\u003cli\u003eAggressive, deep AMG sound without rasp\u003c\/li\u003e\n\u003cli\u003eMaximise gains with an \u003ca href=\"https:\/\/benzunitedparts.com\/products\/m156-ecu-tune-amp-reflash-unlock-the-6-2l-amg-v8\" style=\"color: #004aad;\"\u003eM156 Custom ECU Tune\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"text-align: center; margin: 25px 0;\"\u003e\u003ca style=\"background: #004aad; color: #fff; padding: 12px 22px; border-radius: 6px; font-weight: bold; text-decoration: none; display: inline-block;\" href=\"https:\/\/benzunitedparts.com\/products\/intake-filter-spacer-kit-m156\"\u003eAdd the M156 Intake Spacer Kit — Improve Airflow\u003c\/a\u003e\u003c\/div\u003e\n\u003ch3 style=\"color: #003366; font-size: 18px; margin-top: 25px;\"\u003eWhy Choose BenzUnited Performance?\u003c\/h3\u003e\n\u003cul style=\"font-size: 16px; line-height: 1.7; margin-left: 20px;\"\u003e\n\u003cli\u003eMade in the USA — precision welds and proven fitment\u003c\/li\u003e\n\u003cli\u003eDesigned by real AMG specialists\u003c\/li\u003e\n\u003cli\u003eFast insured worldwide shipping\u003c\/li\u003e\n\u003cli\u003eInstallation guidance and performance support available\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"text-align: center; margin-top: 30px;\"\u003e\u003ca style=\"background: #000; color: #fff; padding: 12px 25px; border-radius: 6px; text-decoration: none; font-weight: bold;\" href=\"https:\/\/benzunitedparts.com\/collections\/m156-performance-parts-c63-e63-cls63-sl63-amg-upgrades\"\u003eM156 Performance Mods\u003c\/a\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center; margin-top: 30px;\"\u003e\n\u003cstrong\u003eOff road use only.\u003c\/strong\u003e Not legal for use on emissions-controlled vehicles or public roads.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":44510886625455,"sku":"BU-M156-HDR-LONG-W221","price":2250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/m156-long-tube-headers-stainless-steel-dyno-gains.png?v=1763785343"},{"product_id":"63-amg-long-tube-headers-m156","title":"M156 Long Tube Headers with Midpipes for C63 AMG E63 CLS63","description":"\u003cdiv style=\"font-family: Arial,sans-serif; line-height: 1.6; color: #333;\"\u003e\n\u003ch2 style=\"font-size: 22px; font-weight: bold; margin-top: 10px; text-align: center;\"\u003eLong Tube Headers for Mercedes AMG M156 — Maximum Power for the 6.2L V8\u003c\/h2\u003e\n\u003cp style=\"text-align: center;\"\u003eUnleash your AMG 63’s true potential with \u003cstrong\u003eM156 Long Tube Headers\u003c\/strong\u003e. Designed for maximum airflow and exhaust scavenging, these T-304 stainless headers deliver dyno-proven gains of \u003cstrong\u003e+39 WHP\u003c\/strong\u003e and \u003cstrong\u003e+34 lb-ft\u003c\/strong\u003e, with included midsection piping for a complete high-flow upgrade. See the dyno chart in the product images.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 18px; font-weight: bold; margin-top: 20px;\"\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong-tube design\u003c\/strong\u003e for maximum exhaust velocity and scavenging\u003c\/li\u003e\n\u003cli\u003eDyno-proven: \u003cstrong\u003e+39 WHP \/ +34 lb-ft\u003c\/strong\u003e on stock M156 engines\u003c\/li\u003e\n\u003cli\u003eIncludes midsection piping (midpipes)\u003c\/li\u003e\n\u003cli\u003eT-304 stainless steel construction\u003c\/li\u003e\n\u003cli\u003eW204 midpipes are direct fit — all others may require fabrication\u003c\/li\u003e\n\u003cli\u003eCompatible with LHD \u0026amp; RHD vehicles\u003c\/li\u003e\n\u003cli\u003eSmooth collectors and TIG welds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"font-size: 18px; font-weight: bold; margin-top: 20px;\"\u003eFitment Compatibility\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin-top: 10px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eYear Range\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eC 63 AMG\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eW204\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2009–2015\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eE 63 AMG\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eW211 \/ W212\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2007–2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eCLS 63 AMG\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eW219\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2007–2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"color: #cc0000; font-weight: bold; text-align: center; margin-top: 12px;\"\u003eW204 = Direct Fit — All Other Chassis Require Fabrication\u003c\/p\u003e\n\u003cdiv style=\"border: 1px solid #e5e7eb; border-radius: 10px; padding: 16px 18px; margin: 26px 0;\"\u003e\n\u003ch3 style=\"margin: 0 0 10px; font-size: 17px;\"\u003eHow Our Three Header Styles Compare\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 14px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #f2f2f2;\"\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\"\u003e \u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\"\u003eShorty\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\"\u003eMid-Length\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\"\u003eLong Tube\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003ePower bias\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eLow \u0026amp; mid-range\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eMid-range into top end\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eTop end\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eFactory cats\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eRetained\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eRemoved\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eRemoved\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eRoad legal\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eRetains emissions equipment\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eNo — off-road only\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eNo — off-road only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003eInstall\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eBolt-on, no welding\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eWelding required\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eWelding usually required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e\u003cstrong\u003ePrice band\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eLowest\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eMiddle\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eHighest\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"margin: 10px 0 0; font-size: 14px;\"\u003eYou are viewing the \u003cstrong\u003elong tube\u003c\/strong\u003e. The \u003ca href=\"\/products\/shorty-headers-for-c63-e63-cls63-amg-m156-6-2l-performance-upgrade\"\u003eM156 shorty\u003c\/a\u003e keeps the cats and bolts on in 3–5 hours; the \u003ca href=\"\/products\/m156-s-and-cl-long-tube-headers\"\u003eS63 \/ CL63 long tube\u003c\/a\u003e is the W221 \/ C216 version of this part.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #e5e7eb; border-radius: 10px; padding: 14px 16px; margin: 22px 0; background: #fafafa;\"\u003e\n\u003cp style=\"margin: 0 0 6px; font-weight: bold; font-size: 15px;\"\u003eYou will likely need: O2 sensor extension harness\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 14px; line-height: 1.6;\"\u003eLong tubes move the rear (post-cat) oxygen sensors well away from the factory harness. Our \u003ca href=\"\/products\/o2-sensor-extension-harness\"\u003e24″ O2 sensor extension harness\u003c\/a\u003e covers the gap with no cutting or splicing. \u003cstrong\u003eYou will need two.\u003c\/strong\u003e Far cheaper to add now than to put the car back on the lift.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: center; margin: 25px 0;\"\u003e\u003ca href=\"\/products\/m156-ecu-tune-amp-reflash-unlock-the-6-2l-amg-v8\" style=\"background: #000; color: #fff; padding: 12px 25px; border-radius: 6px; text-decoration: none; font-weight: bold; font-size: 15px; display: inline-block;\"\u003ePair with an M156 ECU Tune for Maximum Gains\u003c\/a\u003e\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #e5e7eb; border-radius: 10px; padding: 18px 20px; margin: 26px 0;\"\u003e\n\u003ch3 style=\"margin: 0 0 10px; font-size: 17px;\"\u003eWhile The Exhaust Is Off\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 10px; font-size: 15px; color: #444;\"\u003eA header install already has the car on a lift with the exhaust apart. These are the jobs worth combining rather than paying the labour twice:\u003c\/p\u003e\n\u003cul style=\"margin: 0 0 0 18px; padding: 0; line-height: 1.8;\"\u003e\n\u003cli\u003e\n\u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/82mm-throttle-body\"\u003e82mm throttle body\u003c\/a\u003e and the \u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/throttle-body-adapter-plate-m156\"\u003e74→82mm adapter plate\u003c\/a\u003e — the intake-side counterpart to freeing up the exhaust\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/63-amg-aluminum-intake-tubes-m156-high-flow-performance-upgrad\"\u003eAluminium intake tubes\u003c\/a\u003e and the \u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/intake-filter-spacer-kit-m156\"\u003eintake filter spacer kit\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/m156-amg-h-13-head-stud-kit-engine-head-bolt-failure-solution-upgrade\"\u003eH-13 head stud kit\u003c\/a\u003e — the well-known M156 head bolt failure. Far cheaper to address preventatively than after.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/63-amg-5-piece-pulley-set-m156\"\u003e5-piece billet idler pulley set\u003c\/a\u003e and the \u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/oil-catch-can-m156\"\u003eoil catch can kit\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"font-size: 18px; font-weight: bold; margin-top: 30px;\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDo these bolt on, or does my car need fabrication?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eOnly the W204 C63 is a direct fit with the included midpipes. E63 (W211\/W212) and CLS63 (W219) will bolt to the head, but the midsection requires fabrication to mate to your exhaust. Budget for exhaust shop time if you’re not on a W204.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eAre these street legal?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eNo. These are race \/ off-road use only. They remove the factory catalytic converters, which is not emissions-compliant for street use. Weld-in catalytic converters are available if you need to retain cats — ask before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDo I need a tune?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eThe headers will make power without one, but you won’t see the full +39 WHP \/ +34 lb-ft without an ECU tune, and you may set O2 sensor fault codes running catless. Most customers pair these with an M156 ECU tune.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWhat’s actually in the box?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eA pair of T-304 stainless long-tube headers plus the midsection piping (midpipes). Gaskets and hardware requirements vary by chassis — message us with your exact model and year and we’ll confirm what else you’ll need.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill this fit a right-hand-drive car?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes — these are compatible with both LHD and RHD vehicles.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdiv style=\"margin-top: 25px; text-align: center;\"\u003e\u003ca href=\"\/collections\/m156-performance-parts-c63-e63-cls63-sl63-amg-upgrades\" style=\"background-color: #555; color: #fff; padding: 12px 25px; text-decoration: none; font-weight: bold; border-radius: 5px; display: inline-block;\"\u003eMore M156 Performance Parts\u003c\/a\u003e\u003c\/div\u003e\n\u003cdiv style=\"margin-top: 25px; text-align: center;\"\u003e\n\u003cstrong\u003eOff road use only.\u003c\/strong\u003e Not legal for use on emissions-controlled vehicles or public roads.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":44510906122415,"sku":"BU-M156-HDR-LONG-W204","price":1750.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/m156-long-tube-headers-midpipes.jpg?v=1759897529"},{"product_id":"mercedes-e63s-cls63s-4matic-downpipes","title":"M157 Catless Downpipes – Mercedes E63 \/ E63 S W212 (2014–2016) \u0026 CLS63 S C218 (2014–2018) AMG 4MATIC","description":"\u003cdiv style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif; color: #222; line-height: 1.75; max-width: 920px; margin: 0 auto; padding: 24px 20px;\"\u003e\n\u003cp style=\"font-size: 17px; color: #333; margin-bottom: 24px;\"\u003eHigh-flow catless downpipes for the \u003cstrong\u003eMercedes-AMG E63, E63 S (W212 \/ S212) and CLS63 S (C218) with 4MATIC\u003c\/strong\u003e and the M157 5.5L V8 BiTurbo. These replace the primary catalytic converters, the single largest restriction on a stock M157. Back-purged TIG-welded 304 stainless steel, \u003cstrong\u003e3.2″\u003c\/strong\u003e tapering to \u003cstrong\u003e3.0″\u003c\/strong\u003e OD-to-OD, direct bolt-on to the OEM mounting points, roughly \u003cstrong\u003e10–15 lbs\u003c\/strong\u003e lighter than the factory assemblies. In US stock and shipped \u003cstrong\u003enext business day\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp style=\"background: #f8f8f8; padding: 14px 18px; border-radius: 10px; font-size: 15px; margin-bottom: 32px;\"\u003eThese are the \u003cstrong\u003e4MATIC\u003c\/strong\u003e downpipes. Look for the 4MATIC badge on the boot lid or fenders, or driveshafts running to the front wheels. Rear-wheel-drive car? \u003ca href=\"\/products\/mercedes-e63-cls63-m157-downpipes\" style=\"color: #b30000; font-weight: 600;\"\u003eRWD version →\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.2″ Tapering To 3.0″\u003c\/strong\u003e — sized to what the M157 actually flows, OD-to-OD. The taper is deliberate: it accelerates exhaust gas through the section rather than letting it stall in an oversized pipe, which is what protects mid-range torque and turbo response\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTIG-Welded 304 Stainless Steel\u003c\/strong\u003e — back-purged welds throughout, bolting to the factory mounting points, and roughly \u003cstrong\u003e10–15 lbs\u003c\/strong\u003e lighter than the OEM assemblies\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Bolt-On\u003c\/strong\u003e — no cutting or fabrication required; installs in \u003cstrong\u003e2–3 hours\u003c\/strong\u003e. Professional installation is recommended\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4MATIC-Specific Routing\u003c\/strong\u003e — the M157 bi-turbo packaging leaves limited space around heat shielding and fasteners, and the front driveshaft tightens it further. These use platform-specific routing and sealing surfaces so the install stays clean and serviceable\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"background: #1a1a1a; color: #eaeaea; border-left: 4px solid #b30000; border-radius: 10px; padding: 22px 24px; margin-bottom: 32px;\"\u003e\n\u003ch2 style=\"font-size: 20px; margin: 0 0 12px; color: #fff;\"\u003eComplete the Stage 2 Build\u003c\/h2\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThese downpipes are the hardware half of a Stage 2 M157. \u003cstrong\u003eThe tune is what turns them loose\u003c\/strong\u003e — it lets the ECU take advantage of the extra flow, and it \u003cstrong\u003eclears the check-engine light\u003c\/strong\u003e the catless design will otherwise set.\u003c\/p\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003ca href=\"\/products\/custom-ecu-tuning-for-mercedes-e63-cls63-s63-amg\" style=\"color: #ff6b6b; font-weight: bold;\"\u003eAdd the M157 custom ECU tune →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eCompatibility\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin-bottom: 20px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #1a1a1a; color: #fff;\"\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eYears\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eModels\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eW212 Sedan \/ S212 Wagon — 4MATIC\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2014–2016\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eE63 AMG 4MATIC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eW212 Sedan \/ S212 Wagon — 4MATIC\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2014–2016\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eE63 S AMG 4MATIC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eC218 Coupe — 4MATIC\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2014–2018\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eCLS63 S AMG 4MATIC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eWarranty, Shipping \u0026amp; Returns\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-month structural warranty\u003c\/strong\u003e — covers welds, flanges, and structural integrity under normal street use\u003c\/li\u003e\n\u003cli\u003e\nFree U.S. shipping with tracking, shipped \u003cstrong\u003enext business day\u003c\/strong\u003e from US stock\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30-day returns\u003c\/strong\u003e — unused and in original packaging. \u003ca href=\"\/policies\/refund-policy\" style=\"color: #b30000; font-weight: 600;\"\u003eSee full return policy →\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin-bottom: 18px; color: #222;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eHow do I know if my car is 4MATIC?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eLook for the 4MATIC badge on the boot lid or front fenders, and check whether there are driveshafts running to the front wheels. On US-market cars, facelift E63 and E63 S models are 4MATIC.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWhy 3.2″ tapering to 3.0″ and not one straight diameter?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eA downpipe sized past what the engine actually flows drops exhaust gas velocity, and velocity is what carries mid-range torque and turbo response. On the 4MATIC M157 that means \u003cstrong\u003e3.2″\u003c\/strong\u003e at the turbo tapering to \u003cstrong\u003e3.0″\u003c\/strong\u003e, measured OD-to-OD — the taper accelerates gas through the section instead of letting it stall.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDo the E63 and E63 S use the same downpipes?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes. The S is a higher output calibration of the same M157 in the same chassis — the exhaust routing is identical, so this set fits both.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill these work on the stock tune?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eThey fit and run fine on a stock car, and the sharper throttle response is immediate. The power arrives with the calibration. A tune is highly recommended for maximum performance and to clear fault codes.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill I get a check engine light?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eLikely, on an untuned car. Removing the cats means the downstream O₂ sensors read differently than the ECU expects. A calibration resolves it properly — we do not recommend defeat devices.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eAre these street legal?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eNo. These delete the primary catalytic converter. They hold no CARB Executive Order, are not 50-state legal, and are not legal to install on a vehicle registered or operated on public roads in the United States. Sold for closed-course competition and off-road use only — see the emissions notice at the top of this page.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 32px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eIs there a warranty?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes — a \u003cstrong\u003e12-month\u003c\/strong\u003e structural warranty, with guaranteed fitment on every model listed above.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cp style=\"margin-bottom: 36px;\"\u003e\u003ca href=\"mailto:benzunitedparts@gmail.com?subject=M157%204MATIC%20Downpipes%20Question\" style=\"color: #b30000; font-weight: 600;\"\u003eHave a question? Email us →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 36px; text-align: center;\"\u003e\u003cstrong\u003eOff-road Use Only. \u003c\/strong\u003eNot legal for use on emissions-controlled vehicles or public roads.\u003c\/p\u003e\n\u003cdiv style=\"background: #1a1a1a; border-radius: 10px; padding: 12px 14px; margin-bottom: 20px; text-align: center; color: #eaeaea; font-size: 14px;\"\u003e🔧 \u003cstrong\u003eMercedes-AMG Specialists\u003c\/strong\u003e • 💬 \u003cstrong\u003eReal Enthusiast Support\u003c\/strong\u003e • 📦 \u003cstrong\u003eUS Stock\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":44788968489135,"sku":"BU-M157-DP-4MATIC","price":849.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/m157-downpipes-mercedes-cls63s-w218-4matic-stainless-closeup.jpg?v=1760324963"},{"product_id":"mercedes-e63-cls63-m157-downpipes","title":"M157 Catless Downpipes – Mercedes E63 AMG W212 \u0026 CLS63 AMG C218 (2012–2013) RWD 5.5L V8","description":"\u003cdiv style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif; color: #222; line-height: 1.75; max-width: 920px; margin: 0 auto; padding: 24px 20px;\"\u003e\n\u003cp style=\"font-size: 17px; color: #333; margin-bottom: 24px;\"\u003eHigh-flow catless downpipes for the \u003cstrong\u003e2012–2013 Mercedes-AMG E63 (W212 \/ S212) and CLS63 (C218 \/ X218)\u003c\/strong\u003e with the M157 5.5L V8 BiTurbo, rear-wheel drive. These are the \u003cstrong\u003eprimary\u003c\/strong\u003e downpipes — they bolt straight to the turbo outlets and remove the biggest restriction in the system, quickening spool and deepening the AMG tone. Back-purged TIG-welded 304 stainless steel, \u003cstrong\u003e2.75″ primaries tapering to 2.5″\u003c\/strong\u003e, direct bolt-on to the OEM mounting points, roughly \u003cstrong\u003e10–15 lbs\u003c\/strong\u003e lighter than the factory assemblies. In US stock and shipped \u003cstrong\u003enext business day\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp style=\"background: #f8f8f8; padding: 14px 18px; border-radius: 10px; font-size: 15px; margin-bottom: 32px;\"\u003eThese are the \u003cstrong\u003erear-wheel-drive\u003c\/strong\u003e downpipes. Driving a 4MATIC car? \u003ca href=\"\/products\/mercedes-e63s-cls63s-4matic-downpipes\" style=\"color: #b30000; font-weight: 600;\"\u003e4MATIC version →\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.75″ Primaries Tapering To 2.5″\u003c\/strong\u003e — sized to what the M157 actually flows. The taper accelerates exhaust gas through the section rather than letting it stall in an oversized pipe, which is what protects mid-range torque and turbo response\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTIG-Welded 304 Stainless Steel\u003c\/strong\u003e — back-purged welds throughout, bolting to the factory mounting points, and roughly \u003cstrong\u003e10–15 lbs\u003c\/strong\u003e lighter than the OEM assemblies\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Bolt-On\u003c\/strong\u003e — no cutting or fabrication required; installs in \u003cstrong\u003e2–3 hours\u003c\/strong\u003e. Professional installation is recommended\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Cat Removal Where It Counts\u003c\/strong\u003e — the primary catalytic converters are the single largest restriction on a stock M157. Removing them supports quicker turbo spool and a deeper AMG tone under load without excessive drone\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"background: #1a1a1a; color: #eaeaea; border-left: 4px solid #b30000; border-radius: 10px; padding: 22px 24px; margin-bottom: 32px;\"\u003e\n\u003ch2 style=\"font-size: 20px; margin: 0 0 12px; color: #fff;\"\u003eComplete the Stage 2 Build\u003c\/h2\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThese downpipes are the hardware half of a Stage 2 M157. \u003cstrong\u003eThe tune is what turns them loose\u003c\/strong\u003e — it lets the ECU take advantage of the extra flow, and it \u003cstrong\u003eclears the check-engine light\u003c\/strong\u003e the catless design will otherwise set.\u003c\/p\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003ca href=\"\/products\/custom-ecu-tuning-for-mercedes-e63-cls63-s63-amg\" style=\"color: #ff6b6b; font-weight: bold;\"\u003eAdd the M157 custom ECU tune →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eCompatibility\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin-bottom: 24px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #1a1a1a; color: #fff;\"\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eYears\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eModels\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eW212 Sedan \/ S212 Wagon — RWD\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2012–2013\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eE63 AMG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eC218 Coupe \/ X218 Shooting Brake — RWD\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2012–2013\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eCLS63 AMG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eWarranty, Shipping \u0026amp; Returns\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-month structural warranty\u003c\/strong\u003e — covers welds, flanges, and structural integrity under normal street use\u003c\/li\u003e\n\u003cli\u003e\nFree U.S. shipping with tracking, shipped \u003cstrong\u003enext business day\u003c\/strong\u003e from US stock\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30-day returns\u003c\/strong\u003e — unused and in original packaging. \u003ca href=\"\/policies\/refund-policy\" style=\"color: #b30000; font-weight: 600;\"\u003eSee full return policy →\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin-bottom: 18px; color: #222;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWhy 2.75″ and not larger?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eA downpipe sized past what the engine actually flows drops exhaust gas velocity, and velocity is what carries mid-range torque and turbo response. On the RWD M157 that means \u003cstrong\u003e2.75″\u003c\/strong\u003e primaries tapering to \u003cstrong\u003e2.5″\u003c\/strong\u003e — the taper is deliberate, accelerating gas through the section instead of letting it stall.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill these work on the stock tune?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eThe car will run without calibration, but ECU tuning is recommended for best drivability and performance.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill I get a check engine light?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eLikely, on an untuned car. Removing the cats means the downstream O₂ sensors read differently than the ECU expects. A calibration resolves it properly — we do not recommend defeat devices.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eAre these street legal?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eNo. These delete the primary catalytic converter. They hold no CARB Executive Order, are not 50-state legal, and are not legal to install on a vehicle registered or operated on public roads in the United States. Sold for closed-course competition and off-road use only — see the emissions notice at the top of this page.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 32px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eIs there a warranty?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes — a \u003cstrong\u003e12-month\u003c\/strong\u003e structural warranty, with guaranteed fitment on every model listed above.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cp style=\"margin-bottom: 36px;\"\u003e\u003ca href=\"mailto:benzunitedparts@gmail.com?subject=M157%20RWD%20Downpipes%20Question\" style=\"color: #b30000; font-weight: 600;\"\u003eHave a question? Email us →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 36px; text-align: center;\"\u003e\u003cstrong\u003eOff road use only.\u003c\/strong\u003e Not legal for use on emissions-controlled vehicles or public roads.\u003c\/p\u003e\n\u003cdiv style=\"background: #1a1a1a; border-radius: 10px; padding: 12px 14px; margin-bottom: 20px; text-align: center; color: #eaeaea; font-size: 14px;\"\u003e🔧 \u003cstrong\u003eMercedes-AMG Specialists\u003c\/strong\u003e • 💬 \u003cstrong\u003eReal Enthusiast Support\u003c\/strong\u003e • 📦 \u003cstrong\u003eUS Stock\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":44788931821743,"sku":"BU-M157-DP-RWD","price":849.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/m157-downpipes-mercedes-cls63-w218-closeup.jpg?v=1774837128"},{"product_id":"m274-catless-downpipe-mercedes-c300-e300-glc300","title":"M274 Catless Downpipe for Mercedes C300 \/ E300 \/ GLC300 (W205 \/ W213 \/ X253) 2015–2021","description":"\u003cdiv style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif; color: #222; line-height: 1.75; max-width: 920px; margin: 0 auto; padding: 24px 20px;\"\u003e\n\u003cp style=\"font-size: 17px; color: #333; margin-bottom: 24px;\"\u003eThe factory catalytic converter sits directly after the turbo on the \u003cstrong\u003eM274 2.0L turbo\u003c\/strong\u003e and is the single largest restriction in the system. This high-flow catless downpipe removes that bottleneck for noticeably quicker spool, sharper throttle response, stronger mid-range torque and a more aggressive turbo sound — while staying daily-drivable. \u003cstrong\u003e2.75″ diameter\u003c\/strong\u003e, direct bolt-on, fitting the C300 (W205 \/ C205 \/ A205), E300 (W213) and GLC300 (X253) in both RWD and 4MATIC.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eReal Sound \u0026amp; Spool\u003c\/h2\u003e\n\u003ciframe title=\"Mercedes M274 Downpipe Sound\" src=\"https:\/\/www.youtube.com\/embed\/j7nIKh4l6pk\" style=\"max-width: 720px; border-radius: 10px; display: block; margin: 0 auto 32px;\" height=\"340\" width=\"100%\" loading=\"lazy\"\u003e\u003c\/iframe\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.75″ Diameter\u003c\/strong\u003e — sized to what the M274 actually flows. On a 2.0L four, exhaust gas velocity is what carries mid-range torque and turbo response, and a pipe sized past the engine's flow gives that away\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuicker Spool, Sharper Throttle\u003c\/strong\u003e — removing the restriction immediately after the turbo is the largest single response gain available on this platform\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStronger Mid-Range Torque\u003c\/strong\u003e — the part of the powerband a C300 actually lives in, which is why the car feels quicker in everyday driving rather than only at the top end\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Bolt-On\u003c\/strong\u003e — no cutting or fabrication. Professional installation is recommended\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"background: #1a1a1a; color: #eaeaea; border-left: 4px solid #b30000; border-radius: 10px; padding: 22px 24px; margin-bottom: 20px;\"\u003e\n\u003ch2 style=\"font-size: 20px; margin: 0 0 12px; color: #fff;\"\u003eComplete the Stage 2 Build\u003c\/h2\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe downpipe alone wakes the car up. \u003cstrong\u003eThe tune is what turns it loose\u003c\/strong\u003e — it lets the ECU take advantage of the extra flow, and it \u003cstrong\u003eclears the fault code\u003c\/strong\u003e the catless design will otherwise set.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003e\u003ca href=\"\/products\/m274-stage-2-bundle-c300-e300-glc300\" style=\"color: #ff6b6b; font-weight: bold;\"\u003eDownpipe + Stage 2 tune bundle →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 15px;\"\u003ePrefer to pick parts separately? \u003ca href=\"\/products\/m274-i4-2-0l-turbo-custom-ecu-tuning\" style=\"color: #ff6b6b; font-weight: bold;\"\u003eCustom M274 ECU tune\u003c\/a\u003e · \u003ca href=\"\/products\/jb4-plug-and-play-performance-tuner-mercedes-benz-c300-c43-amg-e43-glc-gle\" style=\"color: #ff6b6b; font-weight: bold;\"\u003eJB4 piggyback tuner\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #e5e7eb; border-radius: 10px; padding: 20px 22px; margin-bottom: 36px;\"\u003e\n\u003ch3 style=\"margin: 0 0 12px; font-size: 17px;\"\u003eWhat Else Owners Add At The Same Time\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px; font-size: 15px; color: #444;\"\u003eThe downpipe frees up the exhaust side. Owners running a tune alongside it typically address boost control next, then the brakes to match the extra pace.\u003c\/p\u003e\n\u003cul style=\"padding-left: 20px; line-height: 1.8; font-size: 15px; margin: 0;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eBoost control:\u003c\/strong\u003e \u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/dv-t9358-diverter-valve-for-select-mercedes\"\u003eGFB DV+ T9358 diverter valve\u003c\/a\u003e — the factory diverter is a known weak point once boost climbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBraking:\u003c\/strong\u003e \u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/2015-2023-mercedes-c400-c350e-c300-stainless-steel-braided-brake-lines-w205-c-class\"\u003estainless braided brake lines\u003c\/a\u003e — firmer pedal to match the extra pace\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eCompatibility\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin-bottom: 24px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #1a1a1a; color: #fff;\"\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eYears\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eModels\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eW205 \/ C205 \/ A205\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2015–2021\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eC300\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eW213\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2017–2020\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eE300\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eX253\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2016–2019\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eGLC300\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size: 15px; color: #444; margin-bottom: 36px;\"\u003eAll fitments above use the M274 2.0L turbo. \u003cstrong\u003eRWD and 4MATIC models are both supported.\u003c\/strong\u003e If your car is on that list, this bolts straight on with no cutting or fabrication.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eWarranty, Shipping \u0026amp; Returns\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-month structural warranty\u003c\/strong\u003e — covers welds, flanges, and structural integrity under normal street use\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree U.S. shipping\u003c\/strong\u003e with tracking, shipped next business day from US stock\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30-day returns\u003c\/strong\u003e — unused and in original packaging. \u003ca href=\"\/policies\/refund-policy\" style=\"color: #b30000; font-weight: 600;\"\u003eSee full return policy →\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin-bottom: 18px; color: #222;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWhy 2.75″ and not 3 inches?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eA downpipe sized past what the engine actually flows drops exhaust gas velocity, and velocity is what carries mid-range torque and turbo response. Each downpipe is sized to the engine it fits rather than to one number applied across every platform. The M274 is a 2.0L four — 2.75″ is matched to it, and going wider would cost the low-end response this mod is bought for in the first place.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill I get a check engine light?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eLikely, on an untuned car. Removing the cat means the downstream O₂ sensor reads differently than the ECU expects. A tune resolves it properly — we do not recommend defeat devices.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDo I need a tune?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eThe car will run without one, but tuning is strongly recommended — it is what lets the ECU use the extra flow, and it clears the fault code a catless setup will otherwise set.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDoes this fit 4MATIC cars?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes. Both rear-wheel-drive and 4MATIC versions of the models listed above are supported.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 32px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eIs there a warranty?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes — a 12-month structural warranty, with guaranteed fitment on every model listed above.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cp style=\"margin-bottom: 36px;\"\u003e\u003ca href=\"mailto:benzunitedparts@gmail.com?subject=M274%20Downpipe%20Question\" style=\"color: #b30000; font-weight: 600;\"\u003eHave a question? Email us →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"font-size: 13px; color: #666; text-align: center; margin-top: 20px;\"\u003e\u003cstrong\u003eOff-road Use Only. \u003c\/strong\u003eNot legal for use on emissions-controlled vehicles or public roads.\u003c\/p\u003e\n\u003cdiv style=\"background: #1a1a1a; border-radius: 10px; padding: 12px 14px; margin: 24px 0 20px; text-align: center; color: #eaeaea; font-size: 14px;\"\u003e🔧 \u003cstrong\u003eMercedes-AMG Specialists\u003c\/strong\u003e • 💬 \u003cstrong\u003eReal Enthusiast Support\u003c\/strong\u003e • 📦 \u003cstrong\u003eUS Stock\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":45772834439343,"sku":"BU-M274-DP-W205","price":395.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/mercedes-c300-m274-downpipe-exhaust-sound-tuning.jpg?v=1770484996"},{"product_id":"mercedes-m256-catless-downpipes","title":"M256 Catless Downpipe – E53 CLS53 GT53 GT43 GLE53 GLE450 CLS450 S500 (2017–2020) 3.0L I6","description":"\u003cdiv style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif; color: #222; line-height: 1.75; max-width: 920px; margin: 0 auto; padding: 24px 20px;\"\u003e\n\u003cp style=\"font-size: 17px; color: #333; margin-bottom: 24px;\"\u003eA heat-shielded catless downpipe for the Mercedes \u003cstrong\u003eM256 3.0L turbocharged inline-six\u003c\/strong\u003e, fitting the AMG 53 cars and the non-AMG models that share the engine — E53, CLS53, GT53, GT43, GLE53, GLE450, CLS450 and S500. It replaces the factory catalytic converter to cut exhaust restriction, giving faster turbo spool, sharper throttle response and a richer exhaust note. \u003cstrong\u003e3.5″ inlet tapering to 3.0″\u003c\/strong\u003e (both outside diameter), \u003cstrong\u003e1.5mm wall\u003c\/strong\u003e, with an integrated flex section to reduce vibration and thermal shielding built in rather than sold as an add-on.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.5″ Tapering To 3.0″, 1.5mm Wall\u003c\/strong\u003e — both figures are outside diameter, sized to what the M256 actually flows. The taper accelerates exhaust gas through the section rather than letting it stall in an oversized pipe, which is what protects mid-range torque and turbo response\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Flex Section\u003c\/strong\u003e — absorbs engine movement and reduces vibration passed into the rest of the exhaust, which matters on a longitudinal inline-six sitting in everything from a sedan to a GLE\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Heat Shielding\u003c\/strong\u003e — high-temperature shields cut radiant heat coming off the pipe into the engine bay, protecting nearby wiring, sensors and plastic components. Not a separate add-on and not an option to select\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull Catless Design, Direct Bolt-On\u003c\/strong\u003e — maximum exhaust flow with no cutting or fabrication, across both AMG and non-AMG M256 cars\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"background: #1a1a1a; color: #eaeaea; border-left: 4px solid #b30000; border-radius: 10px; padding: 22px 24px; margin-bottom: 20px;\"\u003e\n\u003ch2 style=\"font-size: 20px; margin: 0 0 12px; color: #fff;\"\u003eYou Will Need Tuning — Your Build Date Decides Which Route\u003c\/h2\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThe downpipe is the hardware half. Tuning is what lets the ECU use the extra flow and resolves the fault codes a catless setup will otherwise set. On the M256 there are two routes.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 12px;\"\u003e\u003cstrong style=\"color: #fff;\"\u003eBuilt before roughly mid-2020:\u003c\/strong\u003e your Bosch MG1CP002 ECU is very likely flashable directly, and a custom calibration gives the most headroom. \u003ca href=\"\/products\/custom-ecu-tune-for-mercedes-m256-3-0l-v6-bi-turbo-e53-amg-cls53-gt53-gle53-gt43-cls450-gle450\" style=\"color: #ff6b6b; font-weight: bold;\"\u003eCustom M256 ECU tune →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 12px;\"\u003e\u003cstrong style=\"color: #fff;\"\u003eBuilt from roughly mid-2020 onward:\u003c\/strong\u003e the ECU ships with factory tuning protection, so flashing means removing it and mailing it out for a bench unlock first. The \u003cstrong\u003eJB4 skips all of that\u003c\/strong\u003e — it never writes to the ECU, so the lock does not apply. Installs in about an hour and comes off without a trace. \u003ca href=\"\/products\/jb4-tuner-for-e450-e53-gle53-gt53-50-100hp-plug-play-tune\" style=\"color: #ff6b6b; font-weight: bold;\"\u003eJB4 plug-and-play tuner →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 14px; color: #bbb;\"\u003eYour build date is printed on the driver's door jamb sticker — check it before choosing a route.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eCompatibility\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin-bottom: 20px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #1a1a1a; color: #fff;\"\u003e\n\u003cth style=\"padding: 13px 14px; text-align: left; border: 1px solid #333;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 13px 14px; text-align: left; border: 1px solid #333;\"\u003eYears\u003c\/th\u003e\n\u003cth style=\"padding: 13px 14px; text-align: left; border: 1px solid #333;\"\u003eModels\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003eW213 — 4MATIC\u003c\/td\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003e2018–2020\u003c\/td\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003eE53 AMG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003eC257 — 4MATIC\u003c\/td\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003e2018–2020\u003c\/td\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003eCLS53 AMG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003eX290 — 4MATIC\u003c\/td\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003e2019–2020\u003c\/td\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003eAMG GT53 4-Door Coupe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003eX290 — 4MATIC\u003c\/td\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003e2019–2020\u003c\/td\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003eAMG GT43 4-Door Coupe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003eV167 — 4MATIC\u003c\/td\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003e2020\u003c\/td\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003eGLE53 AMG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #fafafa;\"\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003eC257 Coupe\u003c\/td\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003e2018–2020\u003c\/td\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003eCLS450\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #fafafa;\"\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003eV167 Base\u003c\/td\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003e2019–2020\u003c\/td\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003eGLE450\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #fafafa;\"\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003eW222 Base\u003c\/td\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003e2017–2020\u003c\/td\u003e\n\u003ctd style=\"padding: 13px 14px; border: 1px solid #ddd;\"\u003eS500\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size: 15px; color: #444; margin-bottom: 36px;\"\u003eAll fitments above use the turbocharged 3.0L inline-six (M256). If your car is on that list, this bolts straight on with no cutting or fabrication.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eWarranty, Shipping \u0026amp; Returns\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-month structural warranty\u003c\/strong\u003e — covers welds, flanges, and structural integrity under normal street use\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree U.S. shipping\u003c\/strong\u003e with tracking, shipped next business day from US stock\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30-day returns\u003c\/strong\u003e — unused and in original packaging. \u003ca href=\"\/policies\/refund-policy\" style=\"color: #b30000; font-weight: 600;\"\u003eSee full return policy →\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin-bottom: 18px; color: #222;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDoes this fit non-AMG cars like the S500 or GLE450?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes. The GLE450, CLS450, and S500 use the same M256 3.0L turbo inline-six as the AMG 53 models. If your car has the M256, this is the right downpipe.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWhy 3.5″ tapering to 3.0″ and not one straight diameter?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eA downpipe sized past what the engine actually flows drops exhaust gas velocity, and velocity is what carries mid-range torque and turbo response. Each downpipe is sized to the engine it fits rather than to one number applied across every platform. The taper here is deliberate — it accelerates gas through the section instead of letting it stall in an oversized pipe.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eMy car is newer — can I still tune it?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes. Cars built from roughly mid-2020 onward have factory tuning protection on the ECU, which a flash tune cannot write to without a mail-in bench unlock. The JB4 piggyback avoids that entirely — it works alongside the factory ECU rather than replacing its software, so the lock does not apply. Your build date on the driver's door jamb sticker tells you which route applies.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill I get a check engine light?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eLikely, on an untuned car. Removing the cat means the downstream O₂ sensor reads differently than the ECU expects. Tuning resolves it properly — we do not recommend defeat devices.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eIs the heat shielding included?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes — the thermal shields are integrated, not a separate add-on. Their job is keeping radiant heat off the surrounding engine bay, not changing how the turbo spools.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eAre these street legal?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eNo — fully catless, intended for off-road and competition use only.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 32px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eIs there a warranty?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes — a 12-month structural warranty, with guaranteed fitment on every model listed above.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cp style=\"margin-bottom: 36px;\"\u003e\u003ca href=\"mailto:benzunitedparts@gmail.com?subject=M256%20Downpipe%20Question\" style=\"color: #b30000; font-weight: 600;\"\u003eHave a question? Email us →\u003c\/a\u003e\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\n\u003cstrong\u003eOff-road and race use only.\u003c\/strong\u003e Not legal for use on emissions-controlled vehicles or public roads. Buyer is responsible for compliance with local laws.\u003c\/div\u003e\n\u003cdiv style=\"background: #1a1a1a; border-radius: 10px; padding: 12px 14px; margin: 24px 0 20px; text-align: center; color: #eaeaea; font-size: 14px;\"\u003e🔧 \u003cstrong\u003eMercedes-AMG Specialists\u003c\/strong\u003e • 💬 \u003cstrong\u003eReal Enthusiast Support\u003c\/strong\u003e • 📦 \u003cstrong\u003eUS Stock\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":45773424754863,"sku":"BU-M256-DP","price":549.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/mercedes-e53-cls53-gt53-m256-catless-downpipe-main.jpg?v=1760758021"},{"product_id":"mid-length-performance-headers-for-mercedes-c55-clk55-slk55-m113-v8","title":"Mid-Length Headers for Mercedes C55 CLK55 SLK55 M113 AMG 5.4L V8 NA","description":"\u003cp\u003eUnlock serious performance from your Mercedes V8 with our \u003cstrong\u003emid-length, high-flow performance headers\u003c\/strong\u003e for the naturally aspirated \u003cstrong\u003e5.4L M113\u003c\/strong\u003e — fitting the C55, CLK55 and SLK55 AMG. TIG-welded stainless steel construction reduces backpressure, improves throttle response and unleashes the deep, aggressive AMG growl.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackpressure reduction:\u003c\/strong\u003e high-flow design improves engine breathing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust note:\u003c\/strong\u003e deep, raw AMG growl under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes mid-pipes:\u003c\/strong\u003e welding required for installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLHD \u0026amp; RHD compatibility:\u003c\/strong\u003e designed to fit global vehicles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e TIG-welded stainless steel, built for durability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment Compatibility\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eEngine\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercedes-Benz C55 AMG\u003c\/td\u003e\n\u003ctd\u003eM113 5.4L Naturally Aspirated V8\u003c\/td\u003e\n\u003ctd\u003e2004–2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercedes-Benz CLK55 AMG\u003c\/td\u003e\n\u003ctd\u003eM113 5.4L Naturally Aspirated V8\u003c\/td\u003e\n\u003ctd\u003e2003–2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercedes-Benz SLK55 AMG\u003c\/td\u003e\n\u003ctd\u003eM113 5.4L Naturally Aspirated V8\u003c\/td\u003e\n\u003ctd\u003e2005–2009\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv style=\"border: 1px solid #e5e7eb; border-radius: 10px; padding: 14px 16px; margin: 22px 0; background: #fafafa;\"\u003e\n\u003cp style=\"margin: 0 0 6px; font-weight: bold; font-size: 15px;\"\u003eYou will likely need: O2 sensor extension harness\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 14px; line-height: 1.6;\"\u003eHeaders relocate the rear (post-cat) oxygen sensors away from the factory harness. Our \u003ca href=\"\/products\/o2-sensor-extension-harness\"\u003e24″ O2 sensor extension harness\u003c\/a\u003e covers the gap with no cutting or splicing. \u003cstrong\u003eMercedes V8s need two.\u003c\/strong\u003e Far cheaper to add now than to put the car back on the lift.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003ePair with our \u003ca href=\"\/products\/m113-ecu-tuning-c55-clk55-slk55-amg\"\u003ecustom ECU tune for the M113\u003c\/a\u003e for maximum performance gains.\u003c\/p\u003e\n\u003ch3\u003eWhy Buy from BenzUnited\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTrusted by tuners and Mercedes enthusiasts.\u003c\/li\u003e\n\u003cli\u003eFast shipping, responsive support and fitment help.\u003c\/li\u003e\n\u003cli\u003eSpecialised in hard-to-source Mercedes performance upgrades.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eBuy With Confidence\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree U.S. shipping\u003c\/strong\u003e with tracking, insured and securely packaged.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment confirmed before you buy:\u003c\/strong\u003e not sure it fits your exact car? Send us your VIN and we’ll verify before you order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMercedes-AMG specialists:\u003c\/strong\u003e we focus exclusively on Mercedes platforms — we know the M113 inside out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReal support:\u003c\/strong\u003e questions before or after purchase go straight to us, not a call center.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"mailto:benzunitedparts@gmail.com?subject=M113%20Headers%20Fitment%20Help\"\u003eConfirm fitment or ask a question →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eWelding required; professional installation highly recommended. Ships within 1–2 business days.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp dir=\"auto\" style=\"text-align: center;\"\u003e\u003cstrong\u003eOff road use only.\u003c\/strong\u003e Not legal for use on emissions-controlled vehicles or public roads.\u003c\/p\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":45787724546223,"sku":"HDR-M113-C55-CLK55-SLK55","price":795.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/m113-mid-length-headers-c55-clk55-slk55-main-kit.jpg?v=1786425058"},{"product_id":"2-25-x-pipe-for-mercedes-na-replacement-for-secondary-cats","title":"M273 5.5L V8 X-Pipe • E550 • CLS550 • SL550 • S550 • CL550 (2006–2011)","description":"\u003cdiv style=\"max-width: 900px; margin: auto; font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; padding: 20px; line-height: 1.7; color: #222;\"\u003e\n\u003cdiv style=\"border:1px solid #e3b7b7;border-left:5px solid #b02a37;border-radius:10px;background:#fdf5f5;padding:14px 16px;margin:0 0 22px;font-size:14px;line-height:1.65;color:#4a2020;\"\u003e\n\u003cstrong style=\"display:block;font-size:15px;color:#b02a37;margin-bottom:6px;\"\u003eEmissions Notice — Depends On How It Is Installed\u003c\/strong\u003eThis is a universal weld-in crossover pipe, not a bolt-in cat-delete section. If it is welded in place of the factory catalytic converters, the vehicle no longer carries its complete emissions system: it will not pass an emissions or OBD inspection, it holds no CARB Executive Order, and it is not legal to operate on public roads in the United States. Installed downstream of the factory catalytic converters with the cats left in place, it removes no emissions equipment. Where it goes is decided at installation — the buyer and installer are responsible for compliance with all federal, state, and local emissions law.\u003c\/div\u003e\n\u003cp style=\"text-align: center; font-size: 18px; color: #1e40af; font-weight: 600;\"\u003eM273 5.5L V8 X-Pipe • E550 • CLS550 • SL550 • S550 • CL550 (2006–2011)\u003c\/p\u003e\n\u003cp style=\"text-align: center; background: #eff6ff; padding: 14px; border-radius: 10px; font-weight: 600;\"\u003e2.25\" Dual High-Flow X-Pipe • Perfect for M273 Performance Upgrades\u003c\/p\u003e\n\u003cp\u003eShift your M273 5.5L V8 power band higher and feel stronger torque at the top end. This high-flow X-pipe is engineered specifically for M273 performance builds — reducing rasp, balancing exhaust pulses, and delivering noticeably more torque and power at higher RPMs when paired with headers or tuning.\u003c\/p\u003e\n\u003ch2 style=\"margin: 26px 0 12px;\"\u003eWhy M273 Owners Choose This X-Pipe\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eForward-placed X-merge creates a clear power band shift with stronger pull at higher RPMs on M273 engines\u003c\/li\u003e\n\u003cli\u003eDual 2.25\" I.D. optimized for M273 naturally aspirated and supercharged builds\u003c\/li\u003e\n\u003cli\u003e409 stainless construction — weld-friendly and heat-cycle tough\u003c\/li\u003e\n\u003cli\u003eMore usable torque and extended power at higher RPMs on tuned M273 5.5L V8s\u003c\/li\u003e\n\u003cli\u003ePerfect complement to M273 ECU tunes, headers, and intake upgrades for peak top-end performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"margin: 26px 0 12px;\"\u003eM273 Compatibility\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #1e40af; color: white;\"\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eE550 • CLS550 • SL550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2007–2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eS550 • CL550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2007–2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eCLK550 • ML550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2006–2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size: 15px; color: #444; margin-top: 18px;\"\u003eAll M273 5.5L V8. The R350 uses the M272 3.5L V6 and is not covered by this listing.\u003c\/p\u003e\n\u003cp style=\"text-align: center; font-size: 13px; color: #666; margin-top: 30px;\"\u003eNeed help with your build? Message us your vehicle — we’ll recommend the perfect setup.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":45808945037487,"sku":"BU-M273-XPIPE-225","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/universal-exhaust-x-pipe-2-25in-dual-to-dual-hero.jpg?v=1755922127"},{"product_id":"shorty-headers-for-mercedes-c240-c320-clk320-e320-m112","title":"Shorty Headers for Mercedes W203 C320 C240 – M112","description":"\u003cdiv style=\"font-family:Arial,sans-serif;max-width:980px;margin:0 auto;line-height:1.55;color:#222;\"\u003e\n\u003cdiv style=\"padding:14px 0;\"\u003e\n\u003ch2 style=\"margin:0 0 8px;font-size:22px;\"\u003eShorty Headers that Respect Low-End Torque\u003c\/h2\u003e\n\u003cp style=\"margin:0 0 10px;\"\u003eOld-school header logic still wins: \u003cstrong\u003eshort primaries keep gas speed up\u003c\/strong\u003e. On the \u003cstrong\u003eM112 V6\u003c\/strong\u003e, that means \u003cstrong\u003esharper throttle\u003c\/strong\u003e and real 2–5k rpm pull without killing drivability — the part of the rev range these cars actually live in.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"border:1px solid #cfe3d4;background:#f2f9f4;border-radius:10px;padding:14px 16px;margin:20px 0;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:700;font-size:15px;\"\u003eEmissions tier: cat-compatible\u003c\/p\u003e\n\u003cp style=\"margin:0;font-size:14px;line-height:1.6;color:#33463a;\"\u003eThis header bolts to the factory catalytic converters and retains OEM-position oxygen sensors. No emissions equipment is removed or bypassed. We do not currently list a CARB Executive Order (EO) number for this part — California-registered vehicles require a CARB EO for aftermarket headers, so confirm your local requirements before ordering. Outside California, check your state’s inspection rules.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"border:1px solid #eee;padding:14px 16px;margin:0 0 16px;\"\u003e\n\u003cstrong style=\"font-size:16px;\"\u003eM112 V6 — C240 \/ C320 \/ CLK320 \/ E320\u003c\/strong\u003e\n\u003cp style=\"margin:8px 0 0;\"\u003eShorty headers match the M112’s low-down torque bias: \u003cstrong\u003eshorter primaries\u003c\/strong\u003e keep velocity high for \u003cstrong\u003equicker response\u003c\/strong\u003e and a stronger mid-range. Expect faster tip-in and a smoother pull to redline.\u003c\/p\u003e\n\u003cul style=\"margin:10px 0 0 18px;padding:0;\"\u003e\n\u003cli\u003eRetains factory catalytic converters and downstream exhaust\u003c\/li\u003e\n\u003cli\u003eBolt-on replacement for the restrictive cast factory manifolds\u003c\/li\u003e\n\u003cli\u003eReplaces factory manifolds 112-140-01-09 \u0026amp; 112-140-00-09\u003c\/li\u003e\n\u003cli\u003eBuilt for street reliability, not a track-only compromise\u003c\/li\u003e\n\u003cli\u003ePairs well with \u003ca style=\"text-decoration:underline;\" href=\"\/products\/kn-drop-in-filters-m112\"\u003eK\u0026amp;N drop-in filters (M112)\u003c\/a\u003e and a sensible ECU tune\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"border:1px solid #e5e7eb;border-radius:10px;padding:14px 16px;margin:22px 0;background:#fafafa;\"\u003e\n\u003cp style=\"margin:0;font-size:15px;line-height:1.6;\"\u003e\u003cstrong\u003eDriving a C32 or SLK32 AMG?\u003c\/strong\u003e Those run the supercharged M112K. We list that application separately, with AMG-specific fitment and install notes — see the \u003ca href=\"\/products\/c32-amg-shorty-headers-m112k\"\u003eC32 \/ SLK32 AMG M112K shorty headers\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cul style=\"margin:0 0 16px 18px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eGains where it counts:\u003c\/strong\u003e crisper throttle, stronger mid-range, cleaner tone\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory compatibility:\u003c\/strong\u003e designed to retain the OEM catalytic converters and cat-back\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall:\u003c\/strong\u003e bolt-on header swap; reuse OEM gaskets \/ hardware where appropriate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupport:\u003c\/strong\u003e ships in 1 business day • 1-year replacement warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"font-size:18px;margin:6px 0;\"\u003eSpecs\u003c\/h3\u003e\n\u003ctable style=\"border-collapse:collapse;width:100%;font-size:15px;margin:6px 0 14px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;width:34%;\"\u003e\u003cstrong\u003eConfiguration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eShort-tube, equalised primary layout; OEM-position collectors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eEmissions Interface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eBolts to the factory cats; downstream O2 sensor locations retained\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eInstall Notes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eUse anti-seize on studs, torque evenly, re-check after one heat cycle. Professional install recommended.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eM112 V6 — C240, C320, CLK320, E320. The C32 \/ SLK32 AMG (M112K) application is listed separately. If unsure, send your VIN.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cdiv style=\"background:#f9f9f9;border:1px solid #eee;padding:10px;font-size:14px;margin:0 0 14px;\"\u003e\n\u003cstrong\u003eTech note:\u003c\/strong\u003e short primaries raise exhaust velocity, which helps cylinder scavenging in the low-to-mid band the M112 likes. Results vary by car, tune and supporting mods.\n\u003c\/div\u003e\n\n\u003cdiv style=\"display:flex;flex-wrap:wrap;gap:10px;font-size:14px;margin:4px 0 0;\"\u003e\n\u003cdiv\u003e✔ Ships in 1 business day\u003c\/div\u003e\n\u003cdiv\u003e✔ 1-year replacement warranty\u003c\/div\u003e\n\u003cdiv\u003e✔ Built for OEM compatibility\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":45809159995567,"sku":"BU-M112-HDR-SHORTY","price":549.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/c320-clk320-e320-c240-shorty-headers-m112.jpg?v=1785144006"},{"product_id":"shorty-headers-for-c63-e63-cls63-amg-m156-6-2l-performance-upgrade","title":"Shorty Headers for C63 E63 CLS63 AMG – M156 6.2L Performance Upgrade","description":"\u003cdiv style=\"font-family:Arial,sans-serif;max-width:900px;margin:auto;line-height:1.65;color:#222;font-size:16px;\"\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eGet the balance of power, sound and drivability for your \u003cstrong\u003eMercedes-Benz 63 AMG\u003c\/strong\u003e with shorty headers for the \u003cstrong\u003eM156 6.2L V8\u003c\/strong\u003e. Built from \u003cstrong\u003e304 stainless steel\u003c\/strong\u003e and hand TIG welded, these shorties increase \u003cstrong\u003emid-range torque\u003c\/strong\u003e, sharpen throttle response and unlock the character of the M156 — while keeping the \u003cstrong\u003efactory catalytic converters in place\u003c\/strong\u003e. No cutting. No welding.\u003c\/p\u003e\n\n\u003cdiv style=\"border:1px solid #cfe3d4;background:#f2f9f4;border-radius:10px;padding:14px 16px;margin:22px 0;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:700;font-size:15px;\"\u003eEmissions tier: cat-compatible\u003c\/p\u003e\n\u003cp style=\"margin:0;font-size:14px;line-height:1.6;color:#33463a;\"\u003eThis header bolts to the factory catalytic converters and retains OEM-position oxygen sensors. No emissions equipment is removed or bypassed. We do not currently list a CARB Executive Order (EO) number for this part — California-registered vehicles require a CARB EO for aftermarket headers, so confirm your local requirements before ordering. Outside California, check your state’s inspection rules.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp style=\"margin:0 0 14px;\"\u003eShorty headers suit M156 owners who want stronger \u003cstrong\u003emid-range response\u003c\/strong\u003e without deleting the factory catalytic converters. Unlike long-tube headers, they maintain low-end torque and drivability — making them a fit for \u003cstrong\u003estreet cars, track days and daily-driven C 63, E 63 and CLS 63 AMG models\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003ch3 style=\"margin-top:20px;margin-bottom:8px;\"\u003eKey Benefits\u003c\/h3\u003e\n\u003cul style=\"margin:0 0 14px 18px;padding:0;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproves mid-range torque\u003c\/strong\u003e where the M156 spends most of its time — track corners and roll-ons.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFaster throttle response\u003c\/strong\u003e from smoother, less restrictive exhaust flow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-piece stainless design\u003c\/strong\u003e built for durability and clean engine bay clearance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100% bolt-on install\u003c\/strong\u003e using factory mounting points, no cutting or welding.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRHD compatible\u003c\/strong\u003e for international markets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.38-inch CNC-machined flange\u003c\/strong\u003e for a warp-resistant, leak-free seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete hardware kit\u003c\/strong\u003e with gaskets and mounting hardware.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e1-year limited warranty.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"margin-top:20px;margin-bottom:8px;\"\u003eExhaust Sound\u003c\/h3\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eShorty headers give the M156 a deeper idle, sharper throttle bark and a more mechanical top-end growl — without turning the car into a drone monster. Because the OEM cats remain in place, the tone stays crisp and daily-friendly.\u003c\/p\u003e\n\n\u003ch3 style=\"margin-top:20px;margin-bottom:8px;\"\u003eSpecifications\u003c\/h3\u003e\n\u003cul style=\"margin:0 0 14px 18px;padding:0;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 304 stainless steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e shorty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCollector diameter (stock):\u003c\/strong\u003e 1.85\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCollector diameter (aftermarket):\u003c\/strong\u003e 2.13\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"margin-top:20px;margin-bottom:8px;\"\u003eCompatibility — Mercedes-Benz M156 6.2L V8\u003c\/h3\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;margin:0 0 14px;font-size:15px;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003cth style=\"border:1px solid #ddd;padding:8px;text-align:left;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ddd;padding:8px;text-align:left;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"border:1px solid #ddd;padding:8px;text-align:left;\"\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eC 63 AMG\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eW204\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e2008–2015\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eE 63 AMG\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eW211 \/ W212\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e2007–2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eCLS 63 AMG\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003eW219\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:8px;\"\u003e2007–2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"margin:0 0 14px;font-size:14px;color:#666;\"\u003eM156-equipped cars only. The 2012+ CLS 63 (W218) uses the M157 biturbo and is not covered.\u003c\/p\u003e\n\n\u003ch3 style=\"margin-top:22px;margin-bottom:8px;\"\u003eShorty vs Long-Tube — Which Is Right for You?\u003c\/h3\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eShorty headers deliver the best \u003cstrong\u003emid-range response\u003c\/strong\u003e, \u003cstrong\u003edrivability\u003c\/strong\u003e and \u003cstrong\u003eOEM-cat compatibility\u003c\/strong\u003e, and they stay street legal. If you want maximum top-end power and can accept an off-road-only car, long-tube headers are the better match.\u003c\/p\u003e\n\u003cdiv style=\"margin:14px 0 20px;text-align:center;\"\u003e\u003ca href=\"\/products\/63-amg-long-tube-headers-m156\" style=\"background-color:#333;color:#fff;padding:10px 18px;border-radius:6px;font-weight:bold;text-decoration:none;\"\u003eCompare: M156 Long-Tube Headers →\u003c\/a\u003e\u003c\/div\u003e\n\n\u003ch3 style=\"margin-top:20px;margin-bottom:8px;\"\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul style=\"margin:0 0 14px 18px;padding:0;\"\u003e\n\u003cli\u003eDirect bolt-on installation using factory hardware.\u003c\/li\u003e\n\u003cli\u003eTypical install time: 3–5 hours.\u003c\/li\u003e\n\u003cli\u003eNo tune required, but \u003cstrong\u003eECU tuning enhances gains\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv style=\"margin-top:10px;padding:14px 16px;background:#f7f7f7;border-radius:8px;border:1px solid #eee;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:bold;\"\u003eThe exhaust upgrade for performance-focused AMG owners who still need to pass inspection.\u003c\/p\u003e\n\u003cp style=\"margin:0;\"\u003eStronger mid-range, better response, OEM fitment and the signature AMG sound — without sacrificing drivability or your catalytic converters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46292799652015,"sku":"BU-M156-HDR-SHORTY","price":1395.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/m156-shorty-headers-mercedes-c63-e63-cls63-amg-performance-exhaust-upgrade.png?v=1763512771"},{"product_id":"wagner-200-cpsi-catted-downpipe-kit-cla45-gla45-m133","title":"Wagner Tuning 200 CPSI Catted Downpipe Kit – Mercedes CLA45 C117 \u0026 GLA45 X156 AMG M133","description":"\u003cdiv style=\"max-width: 920px; margin: 0 auto; padding: 24px 20px; font-family: -apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Arial,sans-serif; line-height: 1.75; color: #222;\"\u003e\n\u003cp style=\"font-size: 17px; color: #333; margin-bottom: 24px;\"\u003eThe \u003cstrong\u003eWagner Tuning 200 CPSI downpipe kit\u003c\/strong\u003e for the Mercedes-AMG \u003cstrong\u003eCLA45 (C117)\u003c\/strong\u003e and \u003cstrong\u003eGLA45 (X156)\u003c\/strong\u003e with the M133 2.0L turbo. Flow-optimised CAD design, Ø76 mm piping, and a 200-cell metal racing catalytic converter — built to cut back pressure and turbo thermal load without going fully catless.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003ePerformance Advantages\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003eSignificantly reduced exhaust back pressure\u003c\/li\u003e\n\u003cli\u003eImproved throttle response and torque delivery\u003c\/li\u003e\n\u003cli\u003eLower thermal load on the turbocharger\u003c\/li\u003e\n\u003cli\u003eOptimised exhaust gas flow for tuned and performance-driven cars\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eEngineering \u0026amp; Materials\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003eCast stainless steel \u003cstrong\u003e1.4301 (SS304)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eØ76 mm diameter before and after the catalytic converter\u003c\/li\u003e\n\u003cli\u003eFlow-optimised CAD design\u003c\/li\u003e\n\u003cli\u003eTwo lambda probe connections for precise exhaust monitoring\u003c\/li\u003e\n\u003cli\u003e200 CPSI metal racing catalytic converter with EU6 coating\u003c\/li\u003e\n\u003cli\u003eLightweight construction — 7.5 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eVehicle Compatibility\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin-bottom: 24px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #1a1a1a; color: #fff;\"\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eEngine\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eMercedes-AMG CLA45\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eC117\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eM133 2.0L Turbo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eMercedes-AMG GLA45\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eX156\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eM133 2.0L Turbo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2 style=\"font-size: 21px; margin-bottom: 18px; color: #222;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill this fit my CLA45 or GLA45?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes — designed for the Mercedes-AMG CLA45 (C117) and GLA45 (X156) with the M133 2.0L turbo engine.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill I get a check engine light?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eLess likely than with a catless setup — the 200 CPSI EU6-coated racing cat is designed to keep the downstream sensors happy on most cars. A calibration is still the cleanest way to run it.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eHow is this different from a catless downpipe?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eA catless downpipe removes the catalytic converter entirely for maximum flow. This kit keeps a high-flow 200-cell metal cat, which flows far better than the factory unit while remaining more street-friendly and quieter at cruise. Neither option is a certified replacement converter — see the emissions notice at the top of this page.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWhat warranty comes with it?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eA 12-month Wagner Tuning manufacturer warranty against material and manufacturing defects. Wagner warranties are non-transferable, and their 48-month extension programme applies to intercoolers only — not to downpipes.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 32px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWhat are the technical specs?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eCast stainless steel 1.4301 (SS304), Ø76 mm pipe diameter, 200 CPSI metal racing catalytic converter, two lambda sensor ports, 7.5 kg.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eBuy With Confidence\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-month Wagner Tuning manufacturer warranty\u003c\/strong\u003e against material and manufacturing defects\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree U.S. shipping\u003c\/strong\u003e with tracking on every order\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment confirmed before you buy\u003c\/strong\u003e — send your VIN and we'll verify before you order\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMercedes specialists\u003c\/strong\u003e — we focus exclusively on Mercedes platforms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReal support\u003c\/strong\u003e — questions before or after purchase go straight to us, not a call center\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin-bottom: 36px;\"\u003e\u003ca href=\"mailto:benzunitedparts@gmail.com?subject=Wagner%20200%20CPSI%20Downpipe%20Help\" style=\"color: #b30000; font-weight: 600;\"\u003eConfirm fitment or ask a question →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center; font-size: 14px; color: #555; font-weight: 600; letter-spacing: 0.3px;\"\u003eBenzUnited Parts • Ships Fast\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46487141351599,"sku":"BU-M133-DP-CLA45-CATTED","price":1140.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/wagner-tuning-200-cpsi-catted-downpipe-kit-cla45-c117-gla45-x156.png?v=1784879104"},{"product_id":"m113-shorty-log-style-headers-mercedes-amg-e500-cls500","title":"M113 Shorty Headers – Mercedes E500 CLS500 NA V8","description":"\u003cdiv style=\"max-width:980px;margin:0 auto;\" class=\"rte\"\u003e\n\u003cdiv style=\"border-radius:16px;padding:22px;background:linear-gradient(135deg,#0b0b0b,#1f1f1f);color:#fff;\"\u003e\n\u003cp style=\"margin:0 0 8px;font-weight:bold;letter-spacing:.4px;color:#d4af37;\"\u003eM113 Naturally Aspirated • Retains Factory Cats\u003c\/p\u003e\n\u003ch2 style=\"margin:0;font-size:28px;line-height:1.15;font-weight:900;\"\u003eM113 Shorty Headers for Mercedes E500 \u0026amp; CLS500\u003c\/h2\u003e\n\u003cp style=\"margin:10px 0 0;color:#d1d5db;font-size:15px;\"\u003eImproved throttle response, stronger mid-range torque and better exhaust flow — while retaining the factory catalytic converters and OEM-style O2 sensor placement.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"border:1px solid #e5c9c9;background:#fdf5f5;border-radius:10px;padding:14px 16px;margin-top:14px;\"\u003e\n\u003cp style=\"margin:0;font-size:14.5px;line-height:1.6;color:#5a3a3a;\"\u003e\u003cstrong\u003eDriving an E55 or CLS55?\u003c\/strong\u003e These are for the naturally aspirated M113 5.0L V8. The supercharged M113K 5.4L takes a different header — see the \u003ca href=\"\/products\/e55-cls55-e500-cls500-amg-log-style-shorty-headers-m113-m113k\" style=\"font-weight:700;\"\u003eM113K shorty log-style headers\u003c\/a\u003e instead.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"display:flex;flex-wrap:wrap;gap:10px;margin-top:14px;\"\u003e\n\u003cdiv style=\"flex:1;min-width:220px;background:#fff;border:1px solid #eee;border-radius:14px;padding:14px;\"\u003e\n\u003cstrong\u003eOEM Cats Retained\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#6b7280;\"\u003eDesigned to work with the factory converters\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1;min-width:220px;background:#fff;border:1px solid #eee;border-radius:14px;padding:14px;\"\u003e\n\u003cstrong\u003eNo-CEL Design\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#6b7280;\"\u003eOEM-style O2 sensor placement\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1;min-width:220px;background:#fff;border:1px solid #eee;border-radius:14px;padding:14px;\"\u003e\n\u003cstrong\u003eComplete Kit\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#6b7280;\"\u003eHeaders, gaskets \u0026amp; mounting hardware\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"border:1px solid #cfe3d4;background:#f2f9f4;border-radius:10px;padding:14px 16px;margin:26px 0;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:700;font-size:15px;\"\u003eEmissions tier: cat-compatible\u003c\/p\u003e\n\u003cp style=\"margin:0;font-size:14px;line-height:1.6;color:#33463a;\"\u003eThis header bolts to the factory catalytic converters and retains OEM-position oxygen sensors. No emissions equipment is removed or bypassed. We do not currently list a CARB Executive Order (EO) number for this part — California-registered vehicles require a CARB EO for aftermarket headers, so confirm your local requirements before ordering. Outside California, check your state’s inspection rules.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#fff;border:1px solid #eee;border-radius:16px;padding:18px;\"\u003e\n\u003cp style=\"margin:0;\"\u003eThese \u003cstrong\u003eM113 shorty headers\u003c\/strong\u003e improve exhaust scavenging and reduce restriction, delivering noticeably sharper throttle response and a stronger mid-range pull without compromising drivability or removing the factory catalytic converters.\u003c\/p\u003e\n\u003cp style=\"margin:10px 0 0;\"\u003eIdeal for daily-driven E500 and CLS500 models looking for a refined, OEM-plus performance upgrade.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-top:14px;background:#fff;border:1px solid #eee;border-radius:16px;padding:18px;\"\u003e\n\u003ch2 style=\"margin:0 0 10px;font-size:20px;font-weight:900;\"\u003ePerformance Benefits\u003c\/h2\u003e\n\u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;\"\u003e\n\u003cdiv style=\"border:1px solid #f1f1f1;border-radius:14px;padding:14px;background:#fafafa;\"\u003e\n\u003cstrong\u003eImproved Mid-Range Torque\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#6b7280;\"\u003eStronger pull in everyday driving\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #f1f1f1;border-radius:14px;padding:14px;background:#fafafa;\"\u003e\n\u003cstrong\u003eCrisper Throttle Response\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#6b7280;\"\u003eReduced exhaust restriction improves pedal feel\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #f1f1f1;border-radius:14px;padding:14px;background:#fafafa;\"\u003e\n\u003cstrong\u003eOEM Emissions Friendly\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#6b7280;\"\u003eDesigned to retain factory emissions equipment\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #f1f1f1;border-radius:14px;padding:14px;background:#fafafa;\"\u003e\n\u003cstrong\u003e304 Stainless Construction\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color:#6b7280;\"\u003eThick flanges for long-term sealing\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-top:14px;background:#fff;border:1px solid #eee;border-radius:16px;padding:18px;\"\u003e\n\u003ch2 style=\"margin:0 0 10px;font-size:20px;font-weight:900;\"\u003eVehicle Compatibility\u003c\/h2\u003e\n\u003cul style=\"margin:0;padding-left:18px;line-height:1.75;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e2003–2006\u003c\/strong\u003e Mercedes-Benz \u003cstrong\u003eE500\u003c\/strong\u003e (W211) — M113 5.0L naturally aspirated V8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2005–2006\u003c\/strong\u003e Mercedes-Benz \u003cstrong\u003eCLS500\u003c\/strong\u003e (W219) — M113 5.0L naturally aspirated V8\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin:10px 0 0;font-size:13px;color:#6b7280;\"\u003eFitment is chassis-specific. Send us your VIN and we’ll confirm before you order.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-top:14px;background:#fff;border:1px solid #eee;border-radius:16px;padding:18px;\"\u003e\n\u003ch2 style=\"margin:0 0 10px;font-size:20px;font-weight:900;\"\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul style=\"margin:0;padding-left:18px;\"\u003e\n\u003cli\u003eDirect bolt-on for W211 \/ W219 M113 applications\u003c\/li\u003e\n\u003cli\u003eInterfaces with factory mid-pipes and catalytic converters\u003c\/li\u003e\n\u003cli\u003eNo cutting or welding required\u003c\/li\u003e\n\u003cli\u003eProfessional installation recommended\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-top:16px;text-align:center;\"\u003e\n\u003ca style=\"display:inline-block;background:#111;color:#fff;padding:12px 22px;border-radius:12px;text-decoration:none;font-weight:900;margin:6px;\" href=\"\/collections\/mercedes-m113-performance-upgrades\"\u003eShop More M113 Upgrades\u003c\/a\u003e \u003ca style=\"display:inline-block;background:#4b5563;color:#fff;padding:12px 22px;border-radius:12px;text-decoration:none;font-weight:900;margin:6px;\" href=\"\/pages\/part-sourcing\"\u003eConfirm Fitment \/ Ask a Question\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46535389741231,"sku":"BU-M113-HDR-SHORTY","price":575.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/m113-shorty-headers-mercedes-amg-e500-cls500_7b3900a3-f98d-43bf-a158-dd5c39bec279.jpg?v=1785487919"},{"product_id":"magnaflow-444105-carb-catalytic-converter-mercedes-amg-na-55-c55-clk55-slk55","title":"MagnaFlow 444105 CARB Catalytic Converter – Mercedes-AMG NA 55 (C55, CLK55, SLK55)","description":"\u003cdiv class=\"rte\" style=\"max-width: 980px; margin: 0 auto;\"\u003e\n\n\u003c!-- HERO --\u003e\n\u003cdiv style=\"border-radius:16px;padding:22px;background:linear-gradient(135deg,#0b0b0b,#1f1f1f);color:#fff;\"\u003e\n  \u003cp style=\"margin:0 0 8px 0;font-weight:700;letter-spacing:.4px;color:#d4af37;\"\u003e\n    M113 5.4L Naturally Aspirated • CARB Compliant Exhaust Solution\n  \u003c\/p\u003e\n  \u003ch1 style=\"margin:0;font-size:28px;line-height:1.15;font-weight:900;\"\u003e\n    MagnaFlow 444105 High-Flow Catalytic Converter for Mercedes-AMG NA 55\n  \u003c\/h1\u003e\n  \u003cp style=\"margin:10px 0 0 0;color:#d1d5db;font-size:15px;\"\u003e\n    California-legal performance replacement engineered for AMG 55 owners who want OEM-level reliability with improved exhaust flow.\n  \u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c!-- TRUST STRIP --\u003e\n\u003cdiv style=\"display:flex;flex-wrap:wrap;gap:10px;margin-top:14px;\"\u003e\n  \u003cdiv style=\"flex:1;min-width:220px;background:#fff;border:1px solid #eee;border-radius:14px;padding:14px;\"\u003e\n    \u003cstrong\u003e✅ CARB Approved\u003c\/strong\u003e\u003cbr\u003e\n    \u003cspan style=\"color:#6b7280;\"\u003eCalifornia emissions compliant\u003c\/span\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"flex:1;min-width:220px;background:#fff;border:1px solid #eee;border-radius:14px;padding:14px;\"\u003e\n    \u003cstrong\u003e✅ AMG-Safe Design\u003c\/strong\u003e\u003cbr\u003e\n    \u003cspan style=\"color:#6b7280;\"\u003eIdeal for M113 NA engines\u003c\/span\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"flex:1;min-width:220px;background:#fff;border:1px solid #eee;border-radius:14px;padding:14px;\"\u003e\n    \u003cstrong\u003e✅ Stainless Construction\u003c\/strong\u003e\u003cbr\u003e\n    \u003cspan style=\"color:#6b7280;\"\u003eDurable, corrosion-resistant build\u003c\/span\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- INTRO --\u003e\n\u003cdiv style=\"background:#fff;border:1px solid #eee;border-radius:16px;padding:18px;margin-top:14px;\"\u003e\n  \u003cp style=\"margin:0;\"\u003e\n    The \u003cstrong\u003eMagnaFlow 444105 catalytic converter\u003c\/strong\u003e is a premium, CARB-compliant solution designed for \n    \u003cstrong\u003eMercedes-AMG 55 models equipped with the naturally aspirated M113 5.4L V8\u003c\/strong\u003e.\n    Whether you’re replacing a failing factory unit or building a compliant custom exhaust, this converter delivers\n    reliable emissions control with improved exhaust efficiency.\n  \u003c\/p\u003e\n  \u003cp style=\"margin:10px 0 0 0;\"\u003e\n    Built from high-grade stainless steel and engineered to meet strict California emissions standards,\n    this converter offers long service life without sacrificing performance or drivability.\n  \u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c!-- BENEFITS --\u003e\n\u003cdiv style=\"margin-top:14px;background:#fff;border:1px solid #eee;border-radius:16px;padding:18px;\"\u003e\n  \u003ch2 style=\"margin:0 0 10px 0;font-size:20px;font-weight:900;\"\u003e\n    Key Benefits\n  \u003c\/h2\u003e\n  \u003cul style=\"margin:0;padding-left:18px;line-height:1.8;\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCARB Compliant:\u003c\/strong\u003e Approved for use in California and emissions-regulated states\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eImproved Exhaust Flow:\u003c\/strong\u003e Less restriction than aging OEM converters\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eStainless Steel Construction:\u003c\/strong\u003e Resists corrosion and thermal fatigue\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOEM-Friendly Design:\u003c\/strong\u003e Ideal for stock or lightly modified NA AMG setups\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eProfessional-Grade Quality:\u003c\/strong\u003e Engineered and manufactured by MagnaFlow\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003c!-- SPECIFICATIONS --\u003e\n\u003cdiv style=\"margin-top:14px;background:#fff;border:1px solid #eee;border-radius:16px;padding:18px;\"\u003e\n  \u003ch2 style=\"margin:0 0 10px 0;font-size:20px;font-weight:900;\"\u003e\n    Technical Specifications\n  \u003c\/h2\u003e\n  \u003cul style=\"margin:0;padding-left:18px;line-height:1.75;\"\u003e\n    \u003cli\u003eInlet Diameter: 2.25 in\u003c\/li\u003e\n    \u003cli\u003eOutlet Diameter: 2.25 in\u003c\/li\u003e\n    \u003cli\u003eMaterial: Stainless Steel\u003c\/li\u003e\n    \u003cli\u003eBody Style: Clam Shell\u003c\/li\u003e\n    \u003cli\u003eOxygen Sensor Ports: None\u003c\/li\u003e\n    \u003cli\u003eInstallation Type: Weld-On (Universal Application)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003c!-- FITMENT --\u003e\n\u003cdiv style=\"margin-top:14px;background:#fff;border:1px solid #eee;border-radius:16px;padding:18px;\"\u003e\n  \u003ch2 style=\"margin:0 0 10px 0;font-size:20px;font-weight:900;\"\u003e\n    Vehicle Compatibility — NA 55 AMG Only\n  \u003c\/h2\u003e\n  \u003cul style=\"margin:0;padding-left:18px;line-height:1.75;\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e2005\u003c\/strong\u003e Mercedes-AMG \u003cstrong\u003eC55\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e2001–2005\u003c\/strong\u003e Mercedes-AMG \u003cstrong\u003eCLK55\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e2005\u003c\/strong\u003e Mercedes-AMG \u003cstrong\u003eSLK55\u003c\/strong\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp style=\"margin-top:10px;font-size:13px;color:#6b7280;\"\u003e\n    ⚠️ Not compatible with supercharged M113K models (E55, SL55, CLS55).\n  \u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c!-- INSTALLATION --\u003e\n\u003cdiv style=\"margin-top:14px;background:#fff;border:1px solid #eee;border-radius:16px;padding:18px;\"\u003e\n  \u003ch2 style=\"margin:0 0 10px 0;font-size:20px;font-weight:900;\"\u003e\n    Installation Notes\n  \u003c\/h2\u003e\n  \u003cul style=\"margin:0;padding-left:18px;\"\u003e\n    \u003cli\u003eUniversal weld-in catalytic converter\u003c\/li\u003e\n    \u003cli\u003eProfessional installation recommended\u003c\/li\u003e\n    \u003cli\u003eEnsure proper alignment for optimal exhaust flow\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003c!-- CTA --\u003e\n\u003cdiv style=\"margin-top:18px;text-align:center;\"\u003e\n  \u003ca href=\"\/collections\/m113-performance-upgrades\" style=\"display:inline-block;background:#111;color:#fff;padding:14px 26px;border-radius:12px;text-decoration:none;font-weight:900;\"\u003e\n    🔧 Shop More M113 AMG Performance Parts\n  \u003c\/a\u003e\n\u003c\/div\u003e\n\n\u003cp style=\"margin-top:18px;font-size:13px;color:#6b7280;text-align:center;\"\u003e\n  Designed for emissions-controlled performance applications. Always verify local regulations before installation.\n\u003c\/p\u003e\n\n\u003c\/div\u003e\n","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46539758338223,"sku":"444105","price":345.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/444105.webp?v=1770200800"},{"product_id":"supersprint-downpipes-cls63-amg-c218-m157-catalytic-delete","title":"Supersprint Downpipes – CLS63 AMG C218 M157 (Catalytic Delete)","description":"\u003cdiv style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif; color: #222; line-height: 1.75; max-width: 920px; margin: 0 auto; padding: 24px 20px;\"\u003e\n\u003cdiv style=\"background: #fff8e1; border: 1px solid #ffd54f; border-radius: 10px; padding: 18px 20px; margin-bottom: 32px;\"\u003e\n\u003cp style=\"margin: 0 0 10px; font-weight: bold; font-size: 16px; color: #7a5900;\"\u003eThese are SECONDARY downpipes — not the primary set\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 10px; color: #5c4400;\"\u003eThe M157 has two sets of catalytic converters. These Supersprint sections replace the \u003cstrong\u003esecondary\u003c\/strong\u003e cats further downstream and do not effect emmisions. The \u003cstrong\u003eprimary\u003c\/strong\u003e downpipes bolt directly to the turbo outlets and are a separate part.\u003c\/p\u003e\n\u003cp style=\"margin: 0; color: #5c4400;\"\u003eLooking for the primary set? \u003ca href=\"https:\/\/benzunitedparts.com\/products\/mercedes-e63-cls63-m157-downpipes\" style=\"color: #b30000; font-weight: bold;\"\u003eM157 primary catless downpipes with bridge pipes →\u003c\/a\u003e • Running both is the full decat.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp style=\"font-size: 17px; color: #333; margin-bottom: 24px;\"\u003eThese \u003cstrong\u003eSupersprint secondary downpipes\u003c\/strong\u003e (part number \u003cstrong\u003e849831\u003c\/strong\u003e) are designed for the \u003cstrong\u003e2012–2018 Mercedes CLS63 AMG (C218)\u003c\/strong\u003e with the \u003cstrong\u003eM157 5.5L BiTurbo V8\u003c\/strong\u003e. They replace the factory secondary catalytic converters with straight-through stainless steel sections, reducing restriction and letting the exhaust flow the way it should.\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 32px;\"\u003eThis is a functional upgrade for owners who want sharper throttle response, a more aggressive exhaust note, and fewer bottlenecks in the system — without changing turbo placement or the primary downpipes.\u003c\/p\u003e\n\u003cdiv style=\"background: #1a1a1a; color: #eaeaea; border-radius: 10px; padding: 20px 22px; margin-bottom: 32px;\"\u003e\n\u003cp style=\"margin: 0 0 8px; font-weight: bold; font-size: 17px; color: #fff;\"\u003eBacked by Supersprint's 36-month warranty\u003c\/p\u003e\n\u003cp style=\"margin: 0; font-size: 15px;\"\u003eSupersprint covers their exhaust products for \u003cstrong\u003e36 months from delivery\u003c\/strong\u003e against defects in materials and workmanship, for the original purchaser. Three years — longer than most performance exhaust hardware on the market. Coverage requires professional installation and no modification to the parts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eWhat This Kit Does\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003eDeletes the factory secondary catalytic converters\u003c\/li\u003e\n\u003cli\u003eImproves exhaust flow downstream of the turbos\u003c\/li\u003e\n\u003cli\u003eEnhances sound clarity and volume without rasp\u003c\/li\u003e\n\u003cli\u003ePairs with stock or aftermarket cat-back systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eConstruction\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003eHigh-grade stainless steel\u003c\/li\u003e\n\u003cli\u003ePrecision fitment for the C218 chassis\u003c\/li\u003e\n\u003cli\u003ePolished finish\u003c\/li\u003e\n\u003cli\u003eSupersprint build quality and welds — founded in 1955, one of the longest-established names in performance exhaust\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eFitment\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin-bottom: 24px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #1a1a1a; color: #fff;\"\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eYears\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eEngine\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2012–2018\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eCLS63 AMG\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eC218\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eM157 5.5L BiTurbo V8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size: 15px; color: #444; margin-bottom: 36px;\"\u003eSupersprint part number \u003cstrong\u003e849831\u003c\/strong\u003e. Not sure which section you need? \u003ca href=\"mailto:benzunitedparts@gmail.com?subject=Supersprint%20Secondary%20Downpipes%20Fitment%20Check\" style=\"color: #b30000; font-weight: 600;\"\u003eSend us your VIN\u003c\/a\u003e and we'll confirm before you order.\u003c\/p\u003e\n\u003cdiv style=\"background: #1a1a1a; color: #eaeaea; border-left: 4px solid #b30000; border-radius: 10px; padding: 22px 24px; margin-bottom: 36px;\"\u003e\n\u003ch2 style=\"font-size: 20px; margin: 0 0 12px; color: #fff;\"\u003ePair With Calibration\u003c\/h2\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eRemoving cats changes what the downstream O₂ sensors report. A calibration keeps the ECU happy and lets you use the extra flow properly.\u003c\/p\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003ca href=\"https:\/\/benzunitedparts.com\/products\/custom-ecu-tuning-for-mercedes-e63-cls63-s63-amg\" style=\"color: #ff6b6b; font-weight: bold;\"\u003eAdd the M157 custom ECU calibration →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 21px; margin-bottom: 18px; color: #222;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWhat's the difference between secondary and primary downpipes?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eThe primary downpipes bolt directly to the turbo outlets, where the largest restriction sits. These secondary sections replace the second set of catalytic converters further down the exhaust. They address different parts of the system and can be run together for a full decat.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWhat warranty comes with these?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eSupersprint's own 36-month warranty from date of delivery, covering defects in materials and workmanship for the original purchaser. Note that it's void if the parts are damaged through improper installation by unqualified personnel, or if they're modified without written authorization — so use a competent shop.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill these set a check engine light?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eThey can on an untuned car, since the secondary O₂ sensors monitor catalyst efficiency. A calibration resolves it properly — we do not recommend defeat devices.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDo I need the primary downpipes as well?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eNo — these work on their own. But the primary downpipes address the bigger restriction, so most owners chasing maximum flow run both.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 32px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eAre these street legal?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eNo. This deletes the secondary catalytic converters. It holds no CARB Executive Order and is not legal to install on a vehicle registered or operated on public roads in the United States. Sold for closed-course competition and off-road use only — see the emissions notice at the top of this page.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eBuy With Confidence\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e36-month Supersprint manufacturer warranty\u003c\/strong\u003e against defects in materials and workmanship\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine Supersprint\u003c\/strong\u003e — Italian-built since 1955\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree U.S. shipping\u003c\/strong\u003e with tracking on every order\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment confirmed before you buy\u003c\/strong\u003e — send your VIN and we'll verify\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReal support\u003c\/strong\u003e — questions before or after purchase go straight to us, not a call center\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin-bottom: 20px;\"\u003e\u003ca href=\"https:\/\/benzunitedparts.com\/collections\/m157-performance-parts-for-mercedes\" style=\"color: #b30000; font-weight: 600;\"\u003eBrowse all M157 performance parts →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center; font-size: 14px; color: #555; font-weight: 600; letter-spacing: 0.3px;\"\u003eLess restriction. More response. Built the right way.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46551700078767,"sku":"849831","price":875.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/supersprint-cls63-amg-c218-m157-secondary-downpipes-cat-delete.webp?v=1770716022"},{"product_id":"catless-downpipes-for-mercedes-benz-s63-amg-w222-m157","title":"W222 S63 AMG M157 Catless Downpipes – Premium Stainless Steel High-Flow Set","description":"\u003cdiv style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif; color: #222; line-height: 1.75; max-width: 920px; margin: 0 auto; padding: 24px 20px;\"\u003e\n\u003cp style=\"font-size: 17px; color: #333; margin-bottom: 24px;\"\u003eHigh-flow catless downpipes for the \u003cstrong\u003e2014–2017 Mercedes-AMG S63 (W222)\u003c\/strong\u003e with the M157 5.5L BiTurbo V8. They replace the factory primary catalytic converters — the single largest restriction in the system — for quicker turbo spool, sharper mid-range response, and a deeper AMG note. Back-purged TIG-welded 304 stainless steel, \u003cstrong\u003e2.71″ primaries tapering to 2.63″\u003c\/strong\u003e, direct bolt-on with no cutting. Supplied as a complete left and right set with V-band clamps, mounting hardware and gaskets. In US stock and shipped \u003cstrong\u003enext business day\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp style=\"background: #f8f8f8; padding: 14px 18px; border-radius: 10px; font-size: 15px; margin-bottom: 32px;\"\u003e\u003cstrong\u003eDriving an E63 or CLS63?\u003c\/strong\u003e Those cars run the same M157 engine, but downpipes are chassis-specific and this set will not fit — \u003ca href=\"\/products\/mercedes-e63-cls63-m157-downpipes\" style=\"color: #b30000; font-weight: 600;\"\u003eE63 \/ CLS63 RWD (2012–2013) →\u003c\/a\u003e · \u003ca href=\"\/products\/mercedes-e63s-cls63s-4matic-downpipes\" style=\"color: #b30000; font-weight: 600;\"\u003eE63 \/ CLS63 4MATIC →\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.71″ Primaries Tapering To 2.63″\u003c\/strong\u003e — sized to what the S63 actually flows, not to a round number. The taper accelerates exhaust gas through the section rather than letting it stall in an oversized pipe, which is what protects mid-range torque and turbo response\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTIG-Welded 304 Stainless Steel\u003c\/strong\u003e — back-purged welds throughout for long-term reliability under repeated heat cycling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Bolt-On Set\u003c\/strong\u003e — left and right downpipes, V-band clamps, mounting hardware and gaskets included. No cutting or modification; installs in \u003cstrong\u003e2–3 hours\u003c\/strong\u003e with professional installation strongly recommended, and re-check for leaks after the first heat cycle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced Exhaust Backpressure\u003c\/strong\u003e — faster turbo spool and a deeper AMG V8 tone, with crackle on overrun once tuned\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eWill downpipes alone add power?\u003c\/h2\u003e\n\u003cdiv style=\"border: 1px solid #e5e7eb; border-radius: 10px; padding: 20px 22px; margin-bottom: 20px; font-size: 15px; color: #333;\"\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eA little. Nothing like the numbers you'll see advertised.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eYour ECU targets a set boost level and holds it with the wastegate. Lower the backpressure and it doesn't raise that target — it just reaches the same number with the gate cracked further open. Fuel is metered to measured airmass to hold a target air-fuel ratio, so if airmass doesn't change, fuelling doesn't change, and neither does power. \u003cstrong\u003eYou don't make more power without burning more fuel, and the ECU decides how much fuel it burns.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThere are two places you do gain on a stock calibration. At the top of the pull the wastegate is already shut and the turbos are at their limit — there's no regulation left, so less restriction means genuinely more airflow and the ECU fuels it. And lower exhaust gas temperatures mean less timing pulled on a knock-limited engine. Together that's a handful of horsepower, mostly at high RPM.\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eWhat you'll \u003cem\u003efeel\u003c\/em\u003e is much bigger than what you'll measure. Boost arrives sooner, so the car is quicker to respond and quicker between gears — which is why owners often report large gains from downpipes alone. That's turbo response, not output.\u003c\/p\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cstrong\u003eThe flow becomes power when the calibration does.\u003c\/strong\u003e A tune raises the boost target and fuels it. Any large figure quoted for \"downpipes alone\" was almost certainly measured on a tuned car — a real number with a misleading label.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #1a1a1a; color: #eaeaea; border-left: 4px solid #b30000; border-radius: 10px; padding: 22px 24px; margin-bottom: 20px;\"\u003e\n\u003ch2 style=\"font-size: 20px; margin: 0 0 12px; color: #fff;\"\u003eComplete the Stage 2 Build\u003c\/h2\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eThese downpipes are the hardware half of a Stage 2 M157. \u003cstrong\u003eThe tune is what turns them loose\u003c\/strong\u003e — it lets the ECU take advantage of the extra flow, and it \u003cstrong\u003eclears the check-engine light\u003c\/strong\u003e the catless design will otherwise set.\u003c\/p\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003ca href=\"\/products\/custom-ecu-tuning-for-mercedes-e63-cls63-s63-amg\" style=\"color: #ff6b6b; font-weight: bold;\"\u003eAdd the M157 custom ECU tune →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #e5e7eb; border-radius: 10px; padding: 20px 22px; margin-bottom: 36px;\"\u003e\n\u003ch3 style=\"margin: 0 0 12px; font-size: 17px;\"\u003eWhat Else Owners Add At The Same Time\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px; font-size: 15px; color: #444;\"\u003eDownpipes free up the exhaust side. These address the intake side, the install itself, and under-hood heat — worth doing together while the car is already on the lift.\u003c\/p\u003e\n\u003cul style=\"padding-left: 20px; line-height: 1.8; font-size: 15px; margin: 0;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake:\u003c\/strong\u003e \u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/performance-intake-spacer-kit-fits-mercedes-benz-m157-engines\"\u003eM157 intake spacer kit\u003c\/a\u003e and \u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/k-n-air-filter-m157\"\u003eK\u0026amp;N high-flow air filters\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall:\u003c\/strong\u003e \u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/o2-sensor-extension-harness\"\u003e24″ O₂ sensor extension harness\u003c\/a\u003e — catless pipes reposition the sensor bungs and the factory leads often will not reach comfortably\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat:\u003c\/strong\u003e \u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/m157-amg-turbo-blankets-heat-shield-upgrade-for-63-series\"\u003eM157 turbo blankets\u003c\/a\u003e — keeps radiant heat off surrounding components in the tight W222 engine bay\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin: 14px 0 0; font-size: 14px; color: #555;\"\u003e\u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/collections\/m157-performance-parts-for-mercedes\"\u003eBrowse all M157 performance parts →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eCompatibility\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin-bottom: 24px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #1a1a1a; color: #fff;\"\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eYears\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eModels\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eW222 Sedan\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2014–2017\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eMercedes-AMG S63\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size: 15px; color: #444; margin-bottom: 36px;\"\u003eAll fitments above use the M157 5.5L BiTurbo V8. If your car is on that list, these bolt straight on with no cutting or fabrication.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eWarranty, Shipping \u0026amp; Returns\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-month structural warranty\u003c\/strong\u003e — covers welds, flanges, and structural integrity under normal street use\u003c\/li\u003e\n\u003cli\u003e\nFree U.S. shipping with tracking, shipped \u003cstrong\u003enext business day\u003c\/strong\u003e from US stock\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30-day returns\u003c\/strong\u003e — unused and in original packaging. \u003ca href=\"\/policies\/refund-policy\" style=\"color: #b30000; font-weight: 600;\"\u003eSee full return policy →\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin-bottom: 18px; color: #222;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWhy 2.71″ and not 3 inches?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eA downpipe sized past what the engine actually flows drops exhaust gas velocity, and velocity is what carries mid-range torque and turbo response. Each downpipe is sized to the engine it fits rather than to one number applied across every platform. The S63 set runs \u003cstrong\u003e2.71″\u003c\/strong\u003e primaries tapering to \u003cstrong\u003e2.63″\u003c\/strong\u003e — nobody specifies to a hundredth of an inch by accident. The taper accelerates gas through the section instead of letting it stall, which is exactly what a generic 3″ pipe sold across four different engine families gives up in the mid-range.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill these throw a check engine light?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eLikely, on an untuned car. Removing the cats means the downstream O₂ sensors read differently than the ECU expects. A calibration resolves it properly — we do not recommend defeat devices.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDo these require a tune?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eThey fit and run fine on a stock car, and the sharper throttle response is immediate. The power arrives with the calibration. A tune is highly recommended for maximum performance and to clear fault codes.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eHow much power can I expect?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eWe do not publish a downpipe-only figure for this platform because we have not dyno'd one, and we will not repeat a number we cannot stand behind. What these change on a stock calibration is response rather than output — see the explanation above. The power comes with the tune, and the exact figure depends on your calibration, fuel grade and supporting modifications.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDo I need the O₂ sensor extension harness?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eOften, yes. A catless downpipe repositions the sensor bungs relative to the factory pipe, and the original leads may not reach comfortably. A 24″ extension avoids stretching or splicing the harness — a small part that prevents a stalled install.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eAre these street legal?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eNo. These delete the primary catalytic converter. They hold no CARB Executive Order, are not 50-state legal, and are not legal to install on a vehicle registered or operated on public roads in the United States. Sold for closed-course competition and off-road use only — see the emissions notice at the top of this page.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 32px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eIs there a warranty?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes — a 12-month structural warranty, with guaranteed fitment on every model listed above.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cp style=\"margin-bottom: 36px;\"\u003e\u003ca href=\"mailto:benzunitedparts@gmail.com?subject=W222%20S63%20Downpipes%20Question\" style=\"color: #b30000; font-weight: 600;\"\u003eHave a question? Email us →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 36px; text-align: center;\"\u003e\u003cstrong\u003eOff road use only.\u003c\/strong\u003e Not legal for use on emissions-controlled vehicles or public roads.\u003c\/p\u003e\n\u003cdiv style=\"background: #1a1a1a; border-radius: 10px; padding: 12px 14px; margin-bottom: 20px; text-align: center; color: #eaeaea; font-size: 14px;\"\u003e🔧 \u003cstrong\u003eMercedes-AMG Specialists\u003c\/strong\u003e • 💬 \u003cstrong\u003eReal Enthusiast Support\u003c\/strong\u003e • 📦 \u003cstrong\u003eUS Stock\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46598480134319,"sku":"BU-M157-DP-W222","price":849.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/w222-s63-amg-m157-catless-downpipes-stainless.jpg?v=1772305144"},{"product_id":"megan-racing-axle-back-exhaust-burnt-rolled-tips-mercedes-w204-c63-amg-2012-2015","title":"Megan Racing Axle-Back Exhaust Burnt Rolled Tips – Mercedes W204 C63 AMG 2012-2015","description":"\u003cdiv style=\"max-width: 100%; line-height: 1.65; color: #222; font-family: inherit;\"\u003e\n\u003ch2 style=\"font-size: 1.45em; margin: 1.2em 0 0.6em; color: #c00;\"\u003eDeeper Tone, Better Flow – Burnt Tips for Your W204 C63 AMG\u003c\/h2\u003e\n\u003cp\u003eReplace the restrictive factory muffler on your 2012-2015 C63 AMG with Megan Racing's axle-back exhaust for unrestricted flow, quicker throttle response, and a rich, aggressive sound without drone. The straight-thru perforated glass-pack muffler cuts backpressure while absorbing frequencies for a mellow yet commanding exhaust note that wakes up the 6.2L V8.\u003c\/p\u003e\n\u003cp\u003eFinished with a signature 4.5″x3.5″ oval burnt rolled tip, it delivers that premium, race-inspired look from the rear. Built from 100% T-304 stainless steel for corrosion resistance and longevity.\u003c\/p\u003e\n\u003ch3\u003ePerfect Fitment – Bolt-On Upgrade\u003c\/h3\u003e\n\u003cul style=\"padding-left: 1.5em; list-style-type: disc; margin: 1em 0;\"\u003e\n\u003cli\u003eDirect replacement for factory axle-back – works with OEM mid-pipe, no modifications needed\u003c\/li\u003e\n\u003cli\u003e2012–2015 Mercedes-Benz C63 AMG (W204 chassis)\u003c\/li\u003e\n\u003cli\u003eDesigned for closed course\/off-highway use only – check local emissions laws\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy C63 Owners Choose Megan Racing\u003c\/h3\u003e\n\u003cul style=\"padding-left: 1.5em; list-style-type: disc; margin: 1.2em 0;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.5″ piping (2.375″ ID)\u003c\/strong\u003e for improved exhaust velocity and reduced restriction\u003c\/li\u003e\n\u003cli\u003eStraight-thru glass-pack muffler – lowers backpressure, boosts response and power delivery\u003c\/li\u003e\n\u003cli\u003eMellow, deep tone with no excessive drone on highway drives\u003c\/li\u003e\n\u003cli\u003e4.5″x3.5″ oval burnt rolled tip – aggressive, premium appearance\u003c\/li\u003e\n\u003cli\u003e100% T-304 stainless steel construction – durable, rust-resistant\u003c\/li\u003e\n\u003cli\u003eLightweight design improves power-to-weight ratio\u003c\/li\u003e\n\u003cli\u003e1-year manufacturer warranty against defects\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"font-style: italic; color: #444; border-left: 4px solid #c00; padding-left: 1em; margin: 2em 0;\"\u003e\"Instantly transformed the sound – deeper growl under load, no cabin drone, and the burnt tips look killer.\" – W204 C63 owner\u003c\/p\u003e\n\u003cp style=\"font-size: 0.9em; color: rgb(85, 85, 85); margin-top: 2em; text-align: center;\"\u003eNote: Exhaust sound is subjective. No returns for personal preference.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46672485318831,"sku":null,"price":809.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/megan-racing-burnt-tips-exhaust-installed-w204-c63-amg-rear.jpg?v=1773256014"},{"product_id":"megan-racing-axle-back-exhaust-stainless-rolled-tips-mercedes-w204-c63-amg-2012-2015","title":"Megan Racing Axle-Back Exhaust Stainless Rolled Tips – Mercedes W204 C63 AMG 2012-2015","description":"\u003cdiv style=\"max-width:100%; line-height:1.65; color:#222; font-family:inherit;\"\u003e\n  \u003ch2 style=\"font-size:1.45em; margin:1.2em 0 0.6em; color:#c00;\"\u003eMellow Deep Tone, Clean Stainless Look – Rolled Tips for Your W204 C63 AMG\u003c\/h2\u003e\n  \n  \u003cp\u003eDitch the restrictive factory muffler on your 2012-2015 C63 AMG and install Megan Racing's axle-back exhaust for freer flow, sharper throttle response, and a refined, aggressive V8 soundtrack without excessive drone. The straight-thru perforated glass-pack muffler minimizes backpressure while the fiber material tames harsh frequencies into a smooth, mellow exhaust note that enhances the 6.2L engine's character.\u003c\/p\u003e\n  \n  \u003cp\u003eFinished with a premium 4.5″x3.5″ oval stainless rolled tip, it provides a sophisticated, factory-plus rear appearance. Constructed from 100% T-304 stainless steel for maximum durability and corrosion resistance.\u003c\/p\u003e\n  \n  \u003ch3\u003ePerfect Fitment – Bolt-On Upgrade\u003c\/h3\u003e\n  \u003cul style=\"padding-left:1.5em; list-style-type:disc; margin:1em 0;\"\u003e\n    \u003cli\u003eDirect replacement for factory axle-back – bolts on with no modifications\u003c\/li\u003e\n    \u003cli\u003e2012–2015 Mercedes-Benz C63 AMG (W204 chassis)\u003c\/li\u003e\n    \u003cli\u003eClosed course\/off-highway use only – verify local emissions regulations\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eWhy C63 Owners Choose Megan Racing\u003c\/h3\u003e\n  \u003cul style=\"padding-left:1.5em; list-style-type:disc; margin:1.2em 0;\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e2.5″ piping (2.375″ ID)\u003c\/strong\u003e for superior exhaust velocity and reduced restriction\u003c\/li\u003e\n    \u003cli\u003eStraight-thru glass-pack muffler – cuts backpressure, improves response and power delivery\u003c\/li\u003e\n    \u003cli\u003eMellow, deep tone with minimal cabin drone for daily and spirited driving\u003c\/li\u003e\n    \u003cli\u003e4.5″x3.5″ oval stainless rolled tip – clean, premium OEM+ aesthetic\u003c\/li\u003e\n    \u003cli\u003e100% T-304 stainless steel – rust-proof and built to last\u003c\/li\u003e\n    \u003cli\u003eLightweight construction enhances overall performance feel\u003c\/li\u003e\n    \u003cli\u003e1-year manufacturer warranty against defects\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003cp style=\"font-style:italic; color:#444; border-left:4px solid #c00; padding-left:1em; margin:2em 0;\"\u003e\n    \"Perfect balance – noticeable growl without being obnoxious, and the stainless tips look factory but better.\" – W204 C63 owner\n  \u003c\/p\u003e\n  \n  \u003cp style=\"font-size:0.9em; color:#555; margin-top:2em;\"\u003eNote: Exhaust sound is subjective. No returns for personal preference. Off-road\/closed course use only – confirm local laws before purchase\/install.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46672492953775,"sku":null,"price":719.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/megan-racing-axle-back-exhaust-stainless-rolled-tip-w204-c63-amg.jpg?v=1773256779"},{"product_id":"megan-racing-cat-back-exhaust-burnt-mercedes-w204-c300-c350-v6-2008-2014","title":"Megan Racing Cat-Back Exhaust Burnt Mercedes W204 C300 C350 V6 2008-2014","description":"\u003cdiv style=\"max-width:100%; line-height:1.65; color:#222; font-family:inherit;\"\u003e\n  \u003ch2 style=\"font-size:1.45em; margin:1.2em 0 0.6em; color:#c00;\"\u003eSubtle Upgrade, Factory Feel – Burnt Tips OE-RS for Your W204 C300\/C350\u003c\/h2\u003e\n  \n  \u003cp\u003eElevate your 2008-2014 Mercedes C300 or C350 V6 Sedan with Megan Racing's OE-RS cat-back exhaust – factory-inspired design with larger 3″ mandrel-bent piping for smoother flow, OEM-style polished mufflers for a refined, quiet tone, and dual 4″ burnt rolled tips that add a premium, aggressive rear look without excessive noise.\u003c\/p\u003e\n  \n  \u003cp\u003eConstructed from high-quality T-304 stainless steel with a polished finish, this system delivers improved exhaust efficiency and a subtle enhancement to throttle response while maintaining daily drivability and a near-stock sound profile.\u003c\/p\u003e\n  \n  \u003ch3\u003ePerfect Fitment – True Bolt-On\u003c\/h3\u003e\n  \u003cul style=\"padding-left:1.5em; list-style-type:disc; margin:1em 0;\"\u003e\n    \u003cli\u003eDirect bolt-on replacement for factory cat-back – includes all hardware, no modifications required\u003c\/li\u003e\n    \u003cli\u003e2008–2014 Mercedes-Benz C-Class C300\/C350 V6 Sedan (W204 chassis, RWD; excludes Coupe, Wagon, 4Matic)\u003c\/li\u003e\n    \u003cli\u003eDesigned for off-road\/closed course use only – check local emissions and SMOG laws\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eWhy W204 Owners Choose OE-RS\u003c\/h3\u003e\n  \u003cul style=\"padding-left:1.5em; list-style-type:disc; margin:1.2em 0;\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e3″ diameter mandrel-bent T-304 stainless piping\u003c\/strong\u003e for better flow and reduced restriction\u003c\/li\u003e\n    \u003cli\u003eOEM-style polished mufflers – quiet, refined sound with minimal drone\u003c\/li\u003e\n    \u003cli\u003eDual 4″ burnt rolled tips – eye-catching, race-inspired appearance\u003c\/li\u003e\n    \u003cli\u003eHigh-polished finish throughout – corrosion-resistant and durable\u003c\/li\u003e\n    \u003cli\u003eImproves exhaust scavenging and throttle response\u003c\/li\u003e\n    \u003cli\u003eComplete kit with gaskets and hardware for easy install\u003c\/li\u003e\n    \u003cli\u003e1-year manufacturer warranty against defects\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003cp style=\"font-style:italic; color:#444; border-left:4px solid #c00; padding-left:1em; margin:2em 0;\"\u003e\n    \"Perfect subtle upgrade – deeper note without being loud, and the burnt tips make the rear pop.\" – W204 C350 owner\n  \u003c\/p\u003e\n  \n  \u003cp style=\"font-size:0.9em; color:#555; margin-top:2em;\"\u003eNote: Exhaust sound is subjective. No returns for personal preference. Off-road\/closed course use only – verify local regulations.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46673366286511,"sku":null,"price":795.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/megan-racing-oe-rs-cat-back-exhaust-burnt-rolled-tips-w204-c300-c350.jpg?v=1773291523"},{"product_id":"megan-racing-axle-back-exhaust-burnt-rolled-tips-mercedes-cla250-gla250-2014-2018-excl-4matic","title":"Megan Racing Axle-Back Exhaust Burnt Rolled Tips – Mercedes CLA250 GLA250 2014-2018 (Excl. 4Matic)","description":"\u003cdiv style=\"max-width:100%; line-height:1.65; color:#222; font-family:inherit;\"\u003e\n  \u003ch2 style=\"font-size:1.45em; margin:1.2em 0 0.6em; color:#c00;\"\u003eMellow Aggressive Tone – Burnt Tip Upgrade for Your CLA250 RWD\u003c\/h2\u003e\n  \n  \u003cp\u003eReplace the restrictive factory muffler on your 2014-2018 Mercedes CLA250 (RWD models) with Megan Racing's axle-back exhaust for freer flow, quicker response, and a refined, mellow exhaust note. The straight-thru perforated glass-pack muffler slashes backpressure while absorbing sound frequencies, delivering a deeper tone without excessive drone or rasp.\u003c\/p\u003e\n  \n  \u003cp\u003eFinished with a standout 4.5″x3.5″ oval burnt rolled tip, it gives the rear a premium, race-inspired look. Built from 100% T-304 stainless steel for lasting durability and corrosion resistance.\u003c\/p\u003e\n  \n  \u003ch3\u003eFitment \u0026amp; Installation Notes\u003c\/h3\u003e\n  \u003cul style=\"padding-left:1.5em; list-style-type:disc; margin:1em 0;\"\u003e\n    \u003cli\u003e2014–2018 Mercedes-Benz CLA250 (C117 chassis, RWD only; excludes 4Matic\/AWD models)\u003c\/li\u003e\n    \u003cli\u003eProfessional installation required – cutting and welding necessary (not direct bolt-on)\u003c\/li\u003e\n    \u003cli\u003eDesigned for closed course\/off-highway use only – check local emissions\/SMOG laws\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eWhy CLA250 Owners Choose This\u003c\/h3\u003e\n  \u003cul style=\"padding-left:1.5em; list-style-type:disc; margin:1.2em 0;\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e2.5″ piping (2.375″ ID)\u003c\/strong\u003e for improved exhaust velocity and reduced restriction\u003c\/li\u003e\n    \u003cli\u003eStraight-thru glass-pack muffler – lowers backpressure, enhances throttle response\u003c\/li\u003e\n    \u003cli\u003eMellow, deep tone with no intrusive cabin drone\u003c\/li\u003e\n    \u003cli\u003e4.5″x3.5″ oval burnt rolled tip – aggressive, high-end appearance\u003c\/li\u003e\n    \u003cli\u003e100% T-304 stainless steel construction – rust-proof and long-lasting\u003c\/li\u003e\n    \u003cli\u003e1-year manufacturer warranty against defects\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003cp style=\"font-style:italic; color:#444; border-left:4px solid #c00; padding-left:1em; margin:2em 0;\"\u003e\n    \"Transformed the CLA's sound – nice mellow growl, burnt tip looks perfect, worth the install.\" – CLA250 owner\n  \u003c\/p\u003e\n  \n  \u003cp style=\"font-size:0.9em; color:#555; margin-top:2em;\"\u003eNote: Exhaust sound is subjective. No returns for personal preference. Off-road\/closed course use only – verify local regulations. Professional install recommended.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46675680198831,"sku":null,"price":556.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/megan-racing-axle-back-exhaust-burnt-rolled-tip-cla250-gla250.jpg?v=1773370262"},{"product_id":"universal-valved-muffler-for-mercedes-w205-c300-c43-c63-w213-e300-e43-remote-t304-upgrade","title":"Universal Valved Muffler for Mercedes W205 C300 C43 C63 \u0026 W213 E300 E43 – Remote T304 Upgrade","description":"\u003ch3\u003eTargeted Fit: Mercedes W205 C-Class \u0026amp; W213 E-Class Without Factory AMG Performance Exhaust Baffles\u003c\/h3\u003e\n\u003cp\u003ePerfect for non-Performance Pack models (no stock valved baffles\/flaps): W205 C300, C43, C400, C450, C63 (non-Perf) and W213 E300, E400, E450, E43 AMG, E63 (non-Perf). Upgrade your quiet factory exhaust to switchable loud\/quiet with key fob remote—reversible, no drone issues.\u003c\/p\u003e\n\n\u003ch3\u003eCritical Fitment \u0026amp; Measurement Warning – Measure Before Purchase!\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStock Exhaust Diameter:\u003c\/strong\u003e Varies by model\/year\/engine—typically 2.5–2.75\" (63–70mm) midpipe\/resonator area on non-AMG\/non-Perf W205\/W213; up to 3\" on some AMG variants. Check your inlet pipe OD (outer diameter) where muffler connects.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUnder-Car Clearance:\u003c\/strong\u003e Rear section is tight (axle, suspension, floorpan—often limited space). Measure current muffler dimensions (height\/width\/depth) and ground clearance. Professional exhaust shop mock-up strongly recommended if unsure.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstallation Note:\u003c\/strong\u003e Universal kit requires adaptation (weld\/bolt-in). Options (2.5\", 3.0\", 3.5\" pipe; single\/dual\/T-style; 1–2 mufflers) help match your setup—select closest to stock for easiest fit.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePro Tip:\u003c\/strong\u003e Jack up the car, measure twice (or send photos\/VIN\/year\/trim), or consult a shop. Not direct bolt-on—custom work common for perfect results. 100% reversible to stock.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eDon't assume fit—measure your W205 or W213 first!\u003c\/strong\u003e Questions on your specific C300\/C43\/E300\/E43 setup? Message us—we help Benz owners avoid headaches.\u003c\/p\u003e","brand":"BenzUnited Parts","offers":[{"title":"Single Inlet Single Outlet \/ 2.5 inch \/ 63 MM \/ 1","offer_id":46688223264943,"sku":null,"price":349.95,"currency_code":"USD","in_stock":true},{"title":"Single Inlet Single Outlet \/ 2.5 inch \/ 63 MM \/ 2","offer_id":46688223297711,"sku":null,"price":529.95,"currency_code":"USD","in_stock":true},{"title":"Single Inlet Single Outlet \/ 3.0 inch \/ 76 MM \/ 1","offer_id":46688223330479,"sku":null,"price":349.95,"currency_code":"USD","in_stock":true},{"title":"Single Inlet Single Outlet \/ 3.0 inch \/ 76 MM \/ 2","offer_id":46688223363247,"sku":null,"price":529.95,"currency_code":"USD","in_stock":true},{"title":"Single Inlet Single Outlet \/ 3.5 inch \/ 89 MM \/ 1","offer_id":46688223396015,"sku":null,"price":349.95,"currency_code":"USD","in_stock":true},{"title":"Single Inlet Single Outlet \/ 3.5 inch \/ 89 MM \/ 2","offer_id":46688223428783,"sku":null,"price":529.95,"currency_code":"USD","in_stock":true},{"title":"Single Inlet Dual Outlet \/ 2.5 inch \/ 63 MM \/ 1","offer_id":46688223461551,"sku":null,"price":349.95,"currency_code":"USD","in_stock":true},{"title":"Single Inlet Dual Outlet \/ 2.5 inch \/ 63 MM \/ 2","offer_id":46688223494319,"sku":null,"price":529.95,"currency_code":"USD","in_stock":true},{"title":"Single Inlet Dual Outlet \/ 3.0 inch \/ 76 MM \/ 1","offer_id":46688223527087,"sku":null,"price":349.95,"currency_code":"USD","in_stock":true},{"title":"Single Inlet Dual Outlet \/ 3.0 inch \/ 76 MM \/ 2","offer_id":46688223559855,"sku":null,"price":529.95,"currency_code":"USD","in_stock":true},{"title":"Single Inlet Dual Outlet \/ 3.5 inch \/ 89 MM \/ 1","offer_id":46688223592623,"sku":null,"price":349.95,"currency_code":"USD","in_stock":true},{"title":"Single Inlet Dual Outlet \/ 3.5 inch \/ 89 MM \/ 2","offer_id":46688223625391,"sku":null,"price":529.95,"currency_code":"USD","in_stock":true},{"title":"T Style \/ 2.5 inch \/ 63 MM \/ 1","offer_id":46688223658159,"sku":null,"price":439.95,"currency_code":"USD","in_stock":true},{"title":"T Style \/ 2.5 inch \/ 63 MM \/ 2","offer_id":46688223690927,"sku":null,"price":529.95,"currency_code":"USD","in_stock":true},{"title":"T Style \/ 3.0 inch \/ 76 MM \/ 1","offer_id":46688223723695,"sku":null,"price":439.95,"currency_code":"USD","in_stock":true},{"title":"T Style \/ 3.0 inch \/ 76 MM \/ 2","offer_id":46688223756463,"sku":null,"price":529.95,"currency_code":"USD","in_stock":true},{"title":"T Style \/ 3.5 inch \/ 89 MM \/ 1","offer_id":46688223789231,"sku":null,"price":439.95,"currency_code":"USD","in_stock":true},{"title":"T Style \/ 3.5 inch \/ 89 MM \/ 2","offer_id":46688223821999,"sku":null,"price":529.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/valved-muffler-kit-closeup-valves.webp?v=1775027564"},{"product_id":"m270-catless-downpipe-mercedes-cla250-gla250","title":"M270 Catless Downpipe – Mercedes CLA250 C117 \u0026 GLA250 X156 (2014–2019) 2.0L Turbo, FWD Only","description":"\u003cdiv style=\"max-width: 920px; margin: 0 auto; padding: 24px 20px; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif; color: #222; line-height: 1.75;\"\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 10px; align-items: center; justify-content: space-between; padding: 14px 16px; border: 1px solid #eaeaea; border-radius: 14px; background: #fafafa; margin-bottom: 24px;\"\u003e\n\u003cdiv style=\"font-weight: 800;\"\u003eCatless Downpipe + Mid-Pipe Kit\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444;\"\u003e\n\u003cstrong\u003eCLA250 \/ GLA250\u003c\/strong\u003e • M270 2.0L Turbo • 2014–2019 (FWD only)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp style=\"font-size: 17px; color: #333; margin-bottom: 32px;\"\u003eReplace your restrictive factory catalytic converter with this high-flow \u003cstrong\u003etwo-piece catless downpipe and mid-pipe kit\u003c\/strong\u003e built specifically for the Mercedes-Benz CLA250 (C117, 2014–2019) and GLA250 (X156, 2015–2019) with the M270 2.0L Turbo. Expect noticeably quicker turbo spool, sharper throttle response, aggressive pops and bangs, and improved power when paired with proper ECU tuning.\u003c\/p\u003e\n\u003cdiv style=\"background: #fff8e1; border: 1px solid #ffd54f; border-radius: 10px; padding: 18px 20px; margin-bottom: 32px;\"\u003e\n\u003cp style=\"margin: 0 0 8px; font-weight: bold; font-size: 16px; color: #7a5900;\"\u003eFront-wheel-drive models only\u003c\/p\u003e\n\u003cp style=\"margin: 0; color: #5c4400;\"\u003eThis kit does not fit 4MATIC cars or the later M260 engine. The engine code and drivetrain decide fitment — confirm both before ordering, or send us your year and model and we'll check.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cp style=\"margin-bottom: 32px;\"\u003eTwo pieces — the catless downpipe and the mid-pipe — with gaskets and hardware, as pictured.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eWhy Upgrade the Factory Downpipe?\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eLouder turbo spool and revs\u003c\/strong\u003e — aggressive sound with pops and bangs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSharper throttle response\u003c\/strong\u003e — faster spool and improved drivability\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e+34 hp \/ +32 lb-ft\u003c\/strong\u003e — with this kit and ECU calibration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"background: #1a1a1a; color: #eaeaea; border-left: 4px solid #b30000; border-radius: 10px; padding: 22px 24px; margin-bottom: 36px;\"\u003e\n\u003ch2 style=\"font-size: 20px; margin: 0 0 12px; color: #fff;\"\u003eComplete the Build\u003c\/h2\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eA catless setup will usually set a check-engine light without proper tuning. \u003cstrong\u003eThe tune is what turns the hardware loose\u003c\/strong\u003e — it lets the ECU use the extra flow and clears the fault codes properly.\u003c\/p\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003ca href=\"https:\/\/benzunitedparts.com\/products\/mercedes-cla250-gla250-ecu-tuning-m270-2-0l-turbo-4-cylinder\" style=\"color: #ff6b6b; font-weight: bold;\"\u003eAdd the M270 custom ECU tune →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eFitment\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin-bottom: 24px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #1a1a1a; color: #fff;\"\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eYears\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eEngine\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2014–2019\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eCLA250 (FWD)\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eC117\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eM270 2.0L Turbo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2015–2019\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eGLA250 (FWD)\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eX156\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eM270 2.0L Turbo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size: 15px; color: #444; margin-bottom: 36px;\"\u003e\u003cstrong\u003eNot sure?\u003c\/strong\u003e \u003ca href=\"mailto:benzunitedparts@gmail.com?subject=M270%20CLA250%20GLA250%20Downpipe%20Fitment%20Check\" style=\"color: #b30000; font-weight: 600;\"\u003eSend us your VIN\u003c\/a\u003e and we'll confirm drivetrain and engine before you order.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003eProfessional installation recommended\u003c\/li\u003e\n\u003cli\u003eInspect and replace gaskets and hardware as needed during installation\u003c\/li\u003e\n\u003cli\u003eRe-check for leaks after the initial heat cycles\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin-bottom: 18px; color: #222;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill this fit my CLA250 or GLA250?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes, for front-wheel-drive cars with the M270 2.0L Turbo — CLA250 (C117) 2014–2019 and GLA250 (X156) 2015–2019. Not for 4MATIC or M260 models.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWhat comes in the kit?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eTwo pieces — the catless downpipe and the mid-pipe — along with gaskets and hardware, as pictured.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDo I need a tune?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eStrongly recommended. Catless downpipes will usually set a check-engine light without proper ECU tuning, and the tune is what unlocks the extra flow.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill I get a check engine light?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eLikely, on an untuned car. Removing the cat means the downstream O₂ sensor reads differently than the ECU expects. Tuning resolves it properly — we do not recommend defeat devices.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eHow loud will this make my car?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eMuch louder turbo spool, revs, and aggressive pops and bangs compared to stock. Sound level depends on your full exhaust setup.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWhat performance gains can I expect?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eFaster turbo spool and sharper throttle response on their own, and \u003cstrong\u003e+34 hp \/ +32 lb-ft\u003c\/strong\u003e once paired with ECU calibration.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 32px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eIs there a warranty?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes — a 12-month structural warranty, with guaranteed fitment on every model listed above.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eBuy With Confidence\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-month structural warranty\u003c\/strong\u003e with guaranteed fitment on listed models\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree U.S. shipping\u003c\/strong\u003e with tracking on every order\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30-day returns\u003c\/strong\u003e on unused, uninstalled items in original packaging — installed exhaust components are not eligible\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment confirmed before you buy\u003c\/strong\u003e — send your VIN and we'll verify before you order\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReal support\u003c\/strong\u003e — questions before or after purchase go straight to us, not a call center\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin-bottom: 36px;\"\u003e\u003ca href=\"mailto:benzunitedparts@gmail.com?subject=M270%20Downpipe%20Fitment%20Help\" style=\"color: #b30000; font-weight: 600;\"\u003eConfirm fitment or ask a question →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 36px; text-align: center;\"\u003e\u003cstrong\u003eOff road use only.\u003c\/strong\u003e Not legal for use on emissions-controlled vehicles or public roads.\u003c\/p\u003e\n\u003cp style=\"text-align: center; font-size: 14px; color: #555; font-weight: 600; letter-spacing: 0.3px;\"\u003eBenzUnited Parts • 12-Month Warranty • Fast, FREE US Shipping\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46701221707951,"sku":"BU-M270-DP-C117","price":549.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/cla250-gla250-catless-downpipes-2014-2019-stainless-steel.jpg?v=1774829791"},{"product_id":"m278-catless-downpipes-mercedes-s550-w222-c217","title":"M278 Catless Downpipes – Mercedes S550 W222 Sedan (2014–2017) \u0026 C217 Coupe (2015–2017) 4.7L V8","description":"\u003cdiv style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif; color: #222; line-height: 1.75; max-width: 920px; margin: 0 auto; padding: 24px 20px;\"\u003e\n\u003cp style=\"font-size: 17px; color: #333; margin-bottom: 24px;\"\u003eHigh-flow catless downpipes for the Mercedes-Benz S550 with the M278 4.7L BiTurbo V8 — the \u003cstrong\u003eW222 sedan (2014–2017)\u003c\/strong\u003e and the \u003cstrong\u003eC217 coupe (2015–2017)\u003c\/strong\u003e. They replace the factory catalytic converters to cut exhaust restriction, which brings faster turbo spool, sharper throttle response and stronger mid-range pull. \u003cstrong\u003eUp to +160 hp and +300 lb-ft\u003c\/strong\u003e with ECU calibration and supporting modifications — those figures are with tuning; the downpipes alone do not produce them. Supplied as a complete left and right set as pictured; hardware and gaskets are not included unless shown in the photos.\u003c\/p\u003e\n\u003cdiv style=\"background: #fff8e1; border: 1px solid #ffd54f; border-radius: 10px; padding: 18px 20px; margin-bottom: 32px;\"\u003e\n\u003cp style=\"margin: 0 0 8px; font-weight: bold; font-size: 16px; color: #7a5900;\"\u003eCheck your chassis, not just the badge\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 10px; color: #5c4400;\"\u003eThe S550 name spans two S-Class generations. \u003cstrong\u003e2011–2013 cars are the W221\u003c\/strong\u003e — they run the same M278 engine but sit on a different chassis with different exhaust routing, and these will not fit them.\u003c\/p\u003e\n\u003cp style=\"margin: 0; color: #5c4400;\"\u003eFrom the 2018 model year the V8 became the \u003cstrong\u003eS560 with the 4.0L M176\u003c\/strong\u003e, which these also do not fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Replacement For The Factory Cats\u003c\/strong\u003e — removes the largest restriction in the exhaust path. Professional installation is recommended; inspect and replace gaskets and hardware as needed, and re-check for leaks after the initial heat cycles\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved Exhaust Flow\u003c\/strong\u003e — lower backpressure lets the turbos operate more efficiently and build boost sooner\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSharper Response\u003c\/strong\u003e — faster spool and stronger mid-range pull, which is where an S-Class actually spends its time\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMore Aggressive Sound\u003c\/strong\u003e — increased volume and a deeper tone than the factory converters, varying with the rest of your exhaust setup\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"background: #1a1a1a; color: #eaeaea; border-left: 4px solid #b30000; border-radius: 10px; padding: 22px 24px; margin-bottom: 20px;\"\u003e\n\u003ch2 style=\"font-size: 20px; margin: 0 0 12px; color: #fff;\"\u003eComplete the Build\u003c\/h2\u003e\n\u003cp style=\"margin: 0 0 14px;\"\u003eA catless setup will typically set a check-engine light without proper calibration. \u003cstrong\u003eThe tune is what turns the hardware loose\u003c\/strong\u003e — it lets the ECU use the extra flow and clears the fault codes properly.\u003c\/p\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003ca href=\"\/products\/custom-ecu-tuning-for-m278-4-7l-v8-biturbo-e550-cls550-s550\" style=\"color: #ff6b6b; font-weight: bold;\"\u003eAdd the M278 custom ECU tune →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #e5e7eb; border-radius: 10px; padding: 20px 22px; margin-bottom: 36px;\"\u003e\n\u003ch3 style=\"margin: 0 0 12px; font-size: 17px;\"\u003eWhat Else Owners Add At The Same Time\u003c\/h3\u003e\n\u003cp style=\"margin: 0 0 12px; font-size: 15px; color: #444;\"\u003eDownpipes free up the exhaust side. These address the intake side and under-hood heat — worth doing together while the car is already on the lift.\u003c\/p\u003e\n\u003cul style=\"padding-left: 20px; line-height: 1.8; font-size: 15px; margin: 0;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake:\u003c\/strong\u003e \u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/amg-m278-4-7l-biturbo-intake-spacer-kit-e550-cls550-s550-cl550-sl550\"\u003eM278 intake filter spacer kit\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat:\u003c\/strong\u003e \u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/m278-turbo-blankets-heat-shield-upgrade-for-e550-cls550-s550\"\u003eM278 turbo blankets\u003c\/a\u003e — keeps radiant heat off surrounding components once the cats are gone\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive accessories:\u003c\/strong\u003e \u003ca style=\"color: #b30000; font-weight: 600;\" href=\"\/products\/m278-2-piece-billet-aluminum-pulley-set-for-mercedes-e550-cls550\"\u003eM278 billet aluminum pulley set\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eCompatibility\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin-bottom: 24px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #1a1a1a; color: #fff;\"\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eYears\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eModels\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eW222 Sedan\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2014–2017\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eS550\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eC217 Coupe\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2015–2017\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eS550\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size: 15px; color: #444; margin-bottom: 36px;\"\u003eAll fitments above use the M278 4.7L BiTurbo V8. If your car is on that list, these bolt straight on with no cutting or fabrication.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eWarranty, Shipping \u0026amp; Returns\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-month structural warranty\u003c\/strong\u003e — covers welds, flanges, and structural integrity under normal street use\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree U.S. shipping\u003c\/strong\u003e with tracking, shipped next business day from US stock\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30-day returns\u003c\/strong\u003e — unused and uninstalled, in original packaging. \u003ca href=\"\/policies\/refund-policy\" style=\"color: #b30000; font-weight: 600;\"\u003eSee full return policy →\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin-bottom: 18px; color: #222;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill these fit my S550?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes for the \u003cstrong\u003eW222 sedan (2014–2017)\u003c\/strong\u003e and the \u003cstrong\u003eC217 coupe (2015–2017)\u003c\/strong\u003e with the M278 4.7L BiTurbo V8. They do not fit the 2011–2013 W221 S550, and they do not fit the 2018-and-later S560 with the M176 4.0L V8.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eMy 2012 S550 has the same M278 engine — why doesn't this fit?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eThe engine is the same, but the car isn't. 2011–2013 S550 models are the previous-generation W221 chassis, which routes its exhaust differently. The W222 replaced it for the 2014 model year, and the C217 coupe arrived for 2015. Downpipes are chassis-specific, not just engine-specific.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDo I need a tune?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eStrongly recommended. A catless setup will usually set a check-engine light without proper calibration, and the tune is what unlocks the flow the hardware now allows.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill I get a check engine light?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eLikely, on an untuned car. Removing the cats means the downstream O₂ sensors read differently than the ECU expects. A calibration resolves it properly — we do not recommend defeat devices.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWhat performance gains can I expect?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eFaster turbo spool, sharper throttle response and stronger mid-range torque on their own. Paired with ECU calibration and supporting modifications, \u003cstrong\u003eup to +160 hp \/ +300 lb-ft\u003c\/strong\u003e is achievable.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eAre these loud?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eThey produce a deeper, more aggressive note than the factory catalytic converters. Sound level depends on your full exhaust setup.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 32px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eIs there a warranty?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes — a 12-month structural warranty, with guaranteed fitment on every model listed above.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cp style=\"margin-bottom: 36px;\"\u003e\u003ca href=\"mailto:benzunitedparts@gmail.com?subject=M278%20S550%20Downpipes%20Question\" style=\"color: #b30000; font-weight: 600;\"\u003eHave a question? Email us →\u003c\/a\u003e\u003c\/p\u003e\n\u003cp dir=\"auto\" style=\"text-align: center;\"\u003e\u003cstrong\u003eOff-road use only.\u003c\/strong\u003e Not legal for use on emissions-controlled vehicles or public roads.\u003c\/p\u003e\n\u003cdiv style=\"background: #1a1a1a; border-radius: 10px; padding: 12px 14px; margin: 24px 0 20px; text-align: center; color: #eaeaea; font-size: 14px;\"\u003e🔧 \u003cstrong\u003eMercedes-AMG Specialists\u003c\/strong\u003e • 💬 \u003cstrong\u003eReal Enthusiast Support\u003c\/strong\u003e • 📦 \u003cstrong\u003eUS Stock\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46717188669615,"sku":"BU-M278-DP-W222","price":849.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/s550-m278-catless-downpipes-w222-c217-304-stainless-set.jpg?v=1784879597"},{"product_id":"m278-catless-downpipes-mercedes-e550-w212-cls550-c218","title":"M278 Catless Downpipes – Mercedes E550 W212 (2012–2016) \u0026 CLS550 C218 (2012–2018) 4.7L V8 BiTurbo","description":"\u003cdiv style=\"max-width: 920px; margin: 0 auto; padding: 24px 20px; font-family: -apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Arial,sans-serif; line-height: 1.75; color: #222;\"\u003e\n\u003cp style=\"font-size: 17px; color: #333; margin-bottom: 32px;\"\u003eUpgrade your Mercedes M278 BiTurbo V8 with these high-flow \u003cstrong\u003ecatless downpipes\u003c\/strong\u003e. Designed for the \u003cstrong\u003e2012–2016 E550 (W212)\u003c\/strong\u003e and \u003cstrong\u003e2012–2018 CLS550 (C218)\u003c\/strong\u003e, they significantly reduce exhaust restriction for faster turbo spool, improved throttle response, and a deeper, more aggressive exhaust note.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eKey Benefits\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-flow catless design\u003c\/strong\u003e — reduces backpressure at the turbo outlets for quicker boost response and stronger mid-range power\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect bolt-on fitment\u003c\/strong\u003e — no cutting or modifications required; replaces the factory catalytic converters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeeper exhaust note\u003c\/strong\u003e — more aggressive tone under load with minimal drone during cruising\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUp to +160 hp \/ +300 lb-ft\u003c\/strong\u003e with ECU calibration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eVehicle Compatibility\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin-bottom: 20px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #1a1a1a; color: #fff;\"\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eYears\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 14px 16px; text-align: left; border: 1px solid #333;\"\u003eEngine\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2012–2016\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eE550 (RWD and 4MATIC)\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eW212\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eM278 4.7L BiTurbo V8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003e2012–2018\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eCLS550 (RWD and 4MATIC)\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eC218\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eM278 4.7L BiTurbo V8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cp style=\"margin-bottom: 32px;\"\u003eComplete left and right downpipe set as pictured. Hardware and gaskets are not included unless shown.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eInstallation\u003c\/h2\u003e\n\u003cp style=\"margin-bottom: 32px;\"\u003eDirect bolt-on replacement. Average install time 1.5–2.5 hours; professional installation recommended. Re-check for leaks after the initial heat cycles.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 21px; margin-bottom: 18px; color: #222;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill these fit my S550?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 8px 0; color: #444;\"\u003eNo — these downpipes are designed for the 2012–2016 E550 (W212) and 2012–2018 CLS550 (C218) with the M278 BiTurbo V8.\u003c\/p\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003ca href=\"https:\/\/benzunitedparts.com\/products\/m278-catless-downpipes-mercedes-s550-w222-c217\" style=\"color: #b30000; font-weight: 600;\"\u003eShop the correct S550 downpipes →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eDo I need a tune?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 0; color: #444;\"\u003eStrongly recommended. Most owners add ECU tuning to avoid check-engine lights and unlock the flow the hardware now allows.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill I get a check engine light?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 0; color: #444;\"\u003eLikely, on an untuned car. Removing the cats means the downstream O₂ sensors read differently than the ECU expects. A calibration resolves it properly — we do not recommend defeat devices.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWhat performance gains can I expect?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 0; color: #444;\"\u003eFaster turbo spool, sharper throttle response, and stronger mid-range torque on their own. Paired with ECU calibration and supporting modifications, \u003cstrong\u003eup to +160 hp \/ +300 lb-ft\u003c\/strong\u003e is achievable. Exact figures depend on your calibration, fuel grade and hardware.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eWill they work with aftermarket exhausts?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 0; color: #444;\"\u003eYes — designed to work with both factory and aftermarket mid-pipes.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 16px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eCan I return them?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 0; color: #444;\"\u003eYes — 30 days on unused, uninstalled items in their original packaging. Installed or modified exhaust components are not eligible for return, so confirm fitment before you install.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 32px; border-bottom: 1px solid #eee; padding-bottom: 16px;\"\u003e\n\u003csummary style=\"font-weight: 600; cursor: pointer; font-size: 16px;\"\u003eIs there a warranty?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 0; color: #444;\"\u003eYes — a 12-month structural warranty, with guaranteed fitment on every model listed above.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eBuy With Confidence\u003c\/h2\u003e\n\u003cul style=\"padding-left: 22px; margin-bottom: 32px; line-height: 1.85; font-size: 16px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-month structural warranty\u003c\/strong\u003e with guaranteed fitment on listed models\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree U.S. shipping\u003c\/strong\u003e with tracking on every order\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30-day returns\u003c\/strong\u003e on unused, uninstalled items in original packaging — installed exhaust components are not eligible\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment confirmed before you buy\u003c\/strong\u003e — send your VIN and we'll verify before you order\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMercedes specialists\u003c\/strong\u003e — we focus exclusively on Mercedes platforms and know the M278 inside out\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReal support\u003c\/strong\u003e — questions before or after purchase go straight to us, not a call center\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\" style=\"text-align: center;\"\u003e\u003cstrong\u003eOff-road use only\u003c\/strong\u003e. Not legal on emissions-controlled vehicles or public roads.\u003c\/p\u003e\n\u003cp style=\"text-align: center; font-size: 14px; color: #555; font-weight: 600; letter-spacing: 0.3px;\"\u003eBenzUnited Parts • 12-Month Warranty • Fast US Shipping\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":47333333958831,"sku":"BU-M278-DP-W212","price":749.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/m278-catless-downpipes-complete-set-e550-cls550.jpg?v=1786315026"},{"product_id":"mid-length-headers-for-mercedes-e500-cls500-sl500-m113-5-0l-v8-na","title":"Mid-Length Headers for Mercedes E500 CLS500 SL500 M113 5.0L V8 NA","description":"\u003cdiv style=\"font-family: Arial, sans-serif; max-width: 850px; margin: auto; padding: 20px; background-color: #f9f9f9; border: 1px solid #ddd; color: #333;\"\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.7;\"\u003eUnlock serious performance from your Mercedes V8 with these \u003cstrong\u003emid-length, high-flow performance headers\u003c\/strong\u003e for naturally aspirated 5.0L M113 engines. TIG-welded from stainless steel, these headers reduce backpressure, improve throttle response, and deliver the deep, aggressive exhaust note these engines are known for.\u003c\/p\u003e\n\u003ch3 style=\"color: #003366;\"\u003e⚙️ Key Features:\u003c\/h3\u003e\n\u003cul style=\"font-size: 16px; line-height: 1.7;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Flow Design:\u003c\/strong\u003e Reduces backpressure and improves engine breathing for better overall performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Potential:\u003c\/strong\u003e Gains of up to +35 hp when paired with tuning and supporting modifications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignature Sound:\u003c\/strong\u003e Produces a deep, raw growl under load that enhances the driving experience.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes Mid-Pipes:\u003c\/strong\u003e Comes with mid-pipes (welding required for installation).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium Construction:\u003c\/strong\u003e TIG-welded stainless steel for strength and long-term durability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlobal Fitment:\u003c\/strong\u003e Designed to work on both LHD and RHD vehicles.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"color: #003366;\"\u003e🚗 Vehicle Compatibility:\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 15px 0; font-size: 15px; background-color: #ffffff; border: 1px solid #ccc;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #003366; color: #ffffff;\"\u003e\n\u003cth style=\"padding: 10px; text-align: left; border: 1px solid #ccc;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 10px; text-align: left; border: 1px solid #ccc;\"\u003eEngine\u003c\/th\u003e\n\u003cth style=\"padding: 10px; text-align: left; border: 1px solid #ccc;\"\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003eE500\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003eM113 5.0L NA V8\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003e2004 – 2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f8f8f8;\"\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003eCLS500\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003eM113 5.0L NA V8\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003e2003 – 2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003eSL500\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003eM113 5.0L NA V8\u003c\/td\u003e\n\u003ctd style=\"padding: 9px; border: 1px solid #ccc;\"\u003e2005 – 2009\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"color: #003366;\"\u003e💡 Why Upgrade?\u003c\/h3\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.7;\"\u003eThese mid-length headers are designed to improve exhaust flow on the M113 5.0L platform while maintaining drivability. The result is sharper throttle response, reduced restriction, and a more engaging exhaust note without excessive drone.\u003c\/p\u003e\n\u003cdiv style=\"background-color: #eef3f8; border-left: 4px solid #003366; padding: 16px; margin-top: 20px;\"\u003e\n\u003cstrong\u003ePair these headers with our custom M113 ECU tune\u003c\/strong\u003e for maximum performance and proper calibration after install.\u003c\/div\u003e\n\u003cp style=\"margin-top: 25px; font-size: 14px; color: #555; text-align: center;\"\u003eFor off-road and racing use only. Not CARB legal. Professional installation recommended. Ships within 1–2 business days.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46990427619503,"sku":null,"price":795.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/m113-mid-length-headers-e500-cls500-sl500-main-kit.jpg?v=1786425256"},{"product_id":"m113-5-0l-v8-x-pipe","title":"M113 5.0L V8 X-Pipe • E500 • CLK500 • S500 • CL500 • SL500 (2003–2011)","description":"\u003cdiv style=\"max-width: 900px; margin: auto; font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; padding: 20px; line-height: 1.7; color: #222;\"\u003e\n\u003cdiv style=\"border:1px solid #e3b7b7;border-left:5px solid #b02a37;border-radius:10px;background:#fdf5f5;padding:14px 16px;margin:0 0 22px;font-size:14px;line-height:1.65;color:#4a2020;\"\u003e\n\u003cstrong style=\"display:block;font-size:15px;color:#b02a37;margin-bottom:6px;\"\u003eEmissions Notice — Depends On How It Is Installed\u003c\/strong\u003eThis is a universal weld-in crossover pipe, not a bolt-in cat-delete section. If it is welded in place of the factory catalytic converters, the vehicle no longer carries its complete emissions system: it will not pass an emissions or OBD inspection, it holds no CARB Executive Order, and it is not legal to operate on public roads in the United States. Installed downstream of the factory catalytic converters with the cats left in place, it removes no emissions equipment. Where it goes is decided at installation — the buyer and installer are responsible for compliance with all federal, state, and local emissions law.\u003c\/div\u003e\n\u003cp style=\"text-align: center; background: #eff6ff; padding: 14px; border-radius: 10px; font-weight: 600;\"\u003e2.25\" Dual High-Flow X-Pipe • Perfect for M113 Performance Upgrades\u003c\/p\u003e\n\u003cp\u003eShift your M113 5.0L V8 power band higher and feel stronger torque in the upper RPM range. This high-flow x-pipe is engineered specifically for M113 builds — reducing rasp, balancing exhaust pulses, and delivering noticeably more usable torque and power at higher RPMs when paired with headers or tuning.\u003c\/p\u003e\n\u003ch2 style=\"margin: 26px 0 12px;\"\u003eWhy M113 Owners Choose This X-Pipe\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eForward-placed X-merge creates a clear power band shift with stronger pull at higher RPMs on M113 engines\u003c\/li\u003e\n\u003cli\u003eDual 2.25\" I.D. optimized for M113 naturally aspirated V8 performance\u003c\/li\u003e\n\u003cli\u003e409 stainless construction — weld-friendly and heat-cycle tough\u003c\/li\u003e\n\u003cli\u003eMore usable torque and extended power at higher RPMs on tuned M113 5.0L V8s\u003c\/li\u003e\n\u003cli\u003ePerfect complement to M113 ECU tunes, headers, and intake upgrades for peak top-end performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"margin: 26px 0 12px;\"\u003eM113 Compatibility\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #1e40af; color: white;\"\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eE500\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2003–2009\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eCLK500\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2003–2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eS500\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2003–2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eCL500\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2003–2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eSL500\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2003–2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eCLS500\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2005–2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eML500\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2003–2007\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"text-align: center; font-size: 13px; color: #666; margin-top: 30px;\"\u003eNeed help with your build? Message us your vehicle — we’ll recommend the perfect setup.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":47103979946159,"sku":null,"price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/universal-exhaust-x-pipe-2-25in-dual-to-dual-hero.jpg?v=1755922127"},{"product_id":"m113-5-4l-v8-x-pipe","title":"M113 5.4L NA AMG X-Pipe • C55 AMG • CLK55 AMG • SLK55 AMG (2003–2006)","description":"\u003cdiv style=\"max-width: 900px; margin: auto; font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; padding: 20px; line-height: 1.7; color: #222;\"\u003e\n\u003cdiv style=\"border:1px solid #e3b7b7;border-left:5px solid #b02a37;border-radius:10px;background:#fdf5f5;padding:14px 16px;margin:0 0 22px;font-size:14px;line-height:1.65;color:#4a2020;\"\u003e\n\u003cstrong style=\"display:block;font-size:15px;color:#b02a37;margin-bottom:6px;\"\u003eEmissions Notice — Depends On How It Is Installed\u003c\/strong\u003eThis is a universal weld-in crossover pipe, not a bolt-in cat-delete section. If it is welded in place of the factory catalytic converters, the vehicle no longer carries its complete emissions system: it will not pass an emissions or OBD inspection, it holds no CARB Executive Order, and it is not legal to operate on public roads in the United States. Installed downstream of the factory catalytic converters with the cats left in place, it removes no emissions equipment. Where it goes is decided at installation — the buyer and installer are responsible for compliance with all federal, state, and local emissions law.\u003c\/div\u003e\n\u003cp style=\"text-align: center; background: #eff6ff; padding: 14px; border-radius: 10px; font-weight: 600;\"\u003e2.25\" Dual High-Flow X-Pipe • Perfect for M113 NA AMG Performance Upgrades\u003c\/p\u003e\n\u003cp\u003eShift your M113 5.4L NA AMG power band higher and feel stronger torque in the upper RPM range. This high-flow x-pipe is engineered specifically for naturally aspirated M113 AMG builds — reducing rasp, balancing exhaust pulses, and delivering noticeably more usable torque and power at higher RPMs when paired with headers or tuning.\u003c\/p\u003e\n\u003ch2 style=\"margin: 26px 0 12px;\"\u003eWhy M113 NA AMG Owners Choose This X-Pipe\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eForward-placed X-merge creates a clear power band shift with stronger pull at higher RPMs on M113 NA AMG engines\u003c\/li\u003e\n\u003cli\u003eDual 2.25\" I.D. optimized for naturally aspirated 5.4L M113 AMG performance\u003c\/li\u003e\n\u003cli\u003e409 stainless construction — weld-friendly and heat-cycle tough\u003c\/li\u003e\n\u003cli\u003eMore usable torque and extended power at higher RPMs on tuned M113 5.4L NA AMG cars\u003c\/li\u003e\n\u003cli\u003ePerfect complement to M113 ECU tunes, headers, and intake upgrades for peak top-end performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"margin: 26px 0 12px;\"\u003eM113 NA 5.4L AMG Compatibility\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #1e40af; color: white;\"\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eC55 AMG\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2005–2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eCLK55 AMG\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2003–2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eSLK55 AMG\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2003–2006\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"text-align: center; font-size: 13px; color: #666; margin-top: 30px;\"\u003eNeed help with your build? Message us your vehicle — we’ll recommend the perfect setup.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":47103981289647,"sku":null,"price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/universal-exhaust-x-pipe-2-25in-dual-to-dual-hero.jpg?v=1755922127"},{"product_id":"m272-3-5l-v6-x-pipe-c350-e350-clk350-2006-2011","title":"2.25\" Dual High-Flow X-Pipe Mercedes E350 C350 C300 M272 3.5L V6","description":"\u003cdiv style=\"max-width: 900px; margin: auto; font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; padding: 20px; line-height: 1.7; color: #222;\"\u003e\n\u003cp style=\"text-align: center; background: #eff6ff; padding: 14px; border-radius: 10px; font-weight: 600;\"\u003e2.25\" Dual High-Flow X-Pipe • Perfect for M272 3.5L V6\u003c\/p\u003e\n\u003c!-- Hero Product Shot --\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/61F9AB2B-50E7-4F7A-B6C5-534B83FEE4C8.jpg?v=1782766175\" alt=\"\"\u003e\n\u003cp\u003eUnlock sharper throttle response and stronger mid-to-high RPM power on your M272 3.5L V6. This high-flow X-pipe improves exhaust flow, reduces backpressure, and gives your engine a deeper sporty tone.\u003c\/p\u003e\n\u003ch2 style=\"margin: 26px 0 12px;\"\u003eWhy M272 Owners Love It\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eOptimized X-merge = better exhaust scavenging \u0026amp; stronger pull\u003c\/li\u003e\n\u003cli\u003eDual 2.25\" piping sized perfectly for the 3.5L V6\u003c\/li\u003e\n\u003cli\u003ePremium 409 stainless steel — durable \u0026amp; easy to weld\u003c\/li\u003e\n\u003cli\u003eNoticeable gains in throttle response + top-end power\u003c\/li\u003e\n\u003cli\u003eGreat with tunes, headers, intake, or throttle body\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- Action \/ Pull Shot --\u003e \u003cimg alt=\"2.25 inch X-pipe installed examples undercarriage, universal dual-exhaust crossover\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/81aHUpNUJ1L._AC_SL1500.jpg?v=1755905233\"\u003e\u003cbr\u003e\n\u003ch2 style=\"margin: 26px 0 12px;\"\u003eM272 3.5L V6 Compatibility (US Spec)\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #1e40af; color: white;\"\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd;\"\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eE350 (W211 \/ C207)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2006–2013\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eCLK350\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2006–2009\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eC350 (W203 \/ W204)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2006–2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eC230 (W203)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2006–2007\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003eSLK350 • ML350 • R350\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2005–2011\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!-- Installed \/ Uphill Shot --\u003e \u003cbr\u003e\u003cstrong\u003ePopular Bundles:\u003c\/strong\u003e\n\u003cp style=\"font-size: 15px; margin: 18px 0;\"\u003e\u003ca href=\"#\" style=\"color: #1e40af; font-weight: bold;\"\u003eStage 1+ Bundle\u003c\/a\u003e → Intake + X-Pipe + Tune\u003c\/p\u003e\n\u003cp style=\"font-size: 15px; margin: 18px 0;\"\u003e\u003ca href=\"#\" style=\"color: #1e40af; font-weight: bold;\"\u003eStage 2+ Bundle\u003c\/a\u003e → Headers + Intake + X-Pipe + Tune\u003c\/p\u003e\n\u003cp style=\"text-align: center; font-size: 13px; color: #666;\"\u003eMessage us your exact model \u0026amp; year — we’ll recommend the best setup fast.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":47125819097263,"sku":null,"price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/universal-exhaust-x-pipe-2-25in-dual-to-dual-hero.jpg?v=1755922127"},{"product_id":"m113-5-4l-na-shorty-headers-mercedes-c55-clk55-slk55-amg","title":"M113 5.4L NA Shorty Headers – Mercedes C55 CLK55 SLK55 AMG","description":"\u003cdiv style=\"max-width: 980px; margin: 0 auto;\" class=\"rte\"\u003e\n\u003c!-- HERO --\u003e\n\u003cdiv style=\"border-radius: 16px; padding: 22px; background: linear-gradient(135deg,#0b0b0b,#1f1f1f); color: #fff;\"\u003e\n\u003cp style=\"margin: 0 0 8px 0; font-weight: bold; letter-spacing: .4px; color: #d4af37;\"\u003eM113 5.4L Naturally Aspirated • OEM-Cat Compatible\u003c\/p\u003e\n\u003cp style=\"margin: 10px 0 0 0; color: #d1d5db; font-size: 15px;\"\u003eImproved throttle response, stronger mid-range torque, and better exhaust flow — while retaining factory catalytic converters and OEM-style O2 sensor placement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- TRUST STRIP --\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px;\"\u003e\n\u003cdiv style=\"flex: 1; min-width: 220px; background: #fff; border: 1px solid #eee; border-radius: 14px; padding: 14px;\"\u003e\n\u003cstrong\u003e✅ OEM Cat Retained\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color: #6b7280;\"\u003eDesigned to work with factory catalytic converters\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; min-width: 220px; background: #fff; border: 1px solid #eee; border-radius: 14px; padding: 14px;\"\u003e\n\u003cstrong\u003e✅ No CEL Design\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color: #6b7280;\"\u003eOEM-style O2 sensor placement\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; min-width: 220px; background: #fff; border: 1px solid #eee; border-radius: 14px; padding: 14px;\"\u003e\n\u003cstrong\u003e✅ Complete Kit\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color: #6b7280;\"\u003eHeaders, gaskets \u0026amp; mounting hardware\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- INTRO --\u003e\n\u003cdiv style=\"background: #fff; border: 1px solid #eee; border-radius: 16px; padding: 18px; margin-top: 14px;\"\u003e\n\u003cp style=\"margin: 0;\"\u003eThese \u003cstrong\u003eM113 shorty headers\u003c\/strong\u003e are built for the \u003cstrong\u003e5.4L naturally aspirated V8\u003c\/strong\u003e found in the NA 55 AMG models. By improving exhaust scavenging and reducing restriction, they deliver noticeably sharper throttle response and a stronger mid-range pull without compromising drivability or removing factory catalytic converters.\u003c\/p\u003e\n\u003cp style=\"margin: 10px 0 0 0;\"\u003eIdeal for daily-driven C55, CLK55 and SLK55 AMG models looking for a refined, OEM-plus performance upgrade.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- BENEFITS --\u003e\n\u003cdiv style=\"margin-top: 14px; background: #fff; border: 1px solid #eee; border-radius: 16px; padding: 18px;\"\u003e\n\u003ch2 style=\"margin: 0 0 10px 0; font-size: 20px; font-weight: 900;\"\u003ePerformance Benefits\u003c\/h2\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px;\"\u003e\n\u003cdiv style=\"border: 1px solid #f1f1f1; border-radius: 14px; padding: 14px; background: #fafafa;\"\u003e\n\u003cstrong\u003eImproved Mid-Range Torque\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color: #6b7280;\"\u003eStronger pull in everyday driving\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #f1f1f1; border-radius: 14px; padding: 14px; background: #fafafa;\"\u003e\n\u003cstrong\u003eCrisper Throttle Response\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color: #6b7280;\"\u003eReduced exhaust restriction improves pedal feel\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #f1f1f1; border-radius: 14px; padding: 14px; background: #fafafa;\"\u003e\n\u003cstrong\u003eOEM Emissions Friendly\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color: #6b7280;\"\u003eDesigned to retain factory emissions equipment\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #f1f1f1; border-radius: 14px; padding: 14px; background: #fafafa;\"\u003e\n\u003cstrong\u003e304 Stainless Construction\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color: #6b7280;\"\u003eThick flanges for long-term sealing\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- FITMENT --\u003e\n\u003cdiv style=\"margin-top: 14px; background: #fff; border: 1px solid #eee; border-radius: 16px; padding: 18px;\"\u003e\n\u003ch2 style=\"margin: 0 0 10px 0; font-size: 20px; font-weight: 900;\"\u003eVehicle Compatibility\u003c\/h2\u003e\n\u003cul style=\"margin: 0; padding-left: 18px; line-height: 1.75;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e[CONFIRM YEARS]\u003c\/strong\u003e Mercedes-Benz \u003cstrong\u003eC55 AMG\u003c\/strong\u003e (W203)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e[CONFIRM YEARS]\u003c\/strong\u003e Mercedes-Benz \u003cstrong\u003eCLK55 AMG\u003c\/strong\u003e (W209)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e[CONFIRM YEARS]\u003c\/strong\u003e Mercedes-Benz \u003cstrong\u003eSLK55 AMG\u003c\/strong\u003e (R171)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin: 10px 0 0 0; font-size: 13px; color: #6b7280;\"\u003eFitment is chassis-specific. Please confirm before ordering if unsure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- INSTALL --\u003e\n\u003cdiv style=\"margin-top: 14px; background: #fff; border: 1px solid #eee; border-radius: 16px; padding: 18px;\"\u003e\n\u003ch2 style=\"margin: 0 0 10px 0; font-size: 20px; font-weight: 900;\"\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul style=\"margin: 0; padding-left: 18px;\"\u003e\n\u003cli\u003eBolt-on for M113 5.4L naturally aspirated applications\u003c\/li\u003e\n\u003cli\u003eInterfaces with factory mid-pipes and catalytic converters\u003c\/li\u003e\n\u003cli\u003eNo cutting or welding required\u003c\/li\u003e\n\u003cli\u003eProfessional installation recommended\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- CTA --\u003e\n\u003cdiv style=\"margin-top: 16px; text-align: center;\"\u003e\n\u003ca style=\"display: inline-block; background: #111; color: #fff; padding: 12px 22px; border-radius: 12px; text-decoration: none; font-weight: 900; margin: 6px;\" href=\"https:\/\/benzunitedparts.com\/collections\/performance-upgrades-for-c55-clk55-slk55-m113-amg-5-4l-v8\"\u003e Shop More M113 Upgrades \u003c\/a\u003e \u003ca style=\"display: inline-block; background: #4b5563; color: #fff; padding: 12px 22px; border-radius: 12px; text-decoration: none; font-weight: 900; margin: 6px;\" href=\"https:\/\/benzunitedparts.com\/pages\/contact\"\u003e Confirm Fitment \/ Ask a Question \u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":47284502626479,"sku":"BU-M113-HDR-SHORTY-54","price":549.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/m113-5-4l-na-shorty-headers-c55-clk55-slk55-main.jpg?v=1786423521"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/collections\/IMG_1246.jpg?v=1729303045","url":"https:\/\/benzunitedparts.com\/collections\/exhaust.oembed?page=3","provider":"BenzUnited Parts","version":"1.0","type":"link"}