{"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=\"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\u003cp style=\"font-size: 13px; color: #555; text-align: center; margin-bottom: 20px;\"\u003e\u003cstrong\u003eOff-road and competition use only.\u003c\/strong\u003e May not comply with local emissions regulations. Buyer is responsible for compliance with local laws.\u003c\/p\u003e\n\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 Set\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444;\"\u003e\n\u003cstrong\u003eS550\u003c\/strong\u003e • M278 BiTurbo V8 • W222 2014–2017 • C217 2015–2017\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cp style=\"font-size: 17px; color: #333; margin-bottom: 32px;\"\u003eReduce exhaust restriction and improve turbo response with a \u003cstrong\u003ecatless downpipe set\u003c\/strong\u003e built for the Mercedes-Benz S550 with the M278 BiTurbo V8 — the \u003cstrong\u003eW222 sedan (2014–2017)\u003c\/strong\u003e and the \u003cstrong\u003eC217 coupe (2015–2017)\u003c\/strong\u003e. Designed to increase exhaust flow for faster spool and stronger mid-range response, especially when paired with proper ECU calibration.\u003c\/p\u003e\n\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: 700; 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\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 in the photos.\u003c\/p\u003e\n\n\u003ch2 style=\"font-size: 21px; margin: 0 0 14px; color: #222;\"\u003eWhy Upgrade the Factory Downpipes?\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\u003e+118 hp \/ +190 lb-ft\u003c\/strong\u003e — with these downpipes and ECU calibration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved exhaust flow\u003c\/strong\u003e — reduces backpressure for more efficient turbo operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSharper response\u003c\/strong\u003e — faster spool and stronger mid-range pull\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMore aggressive sound\u003c\/strong\u003e — increased volume and a deeper tone, varying by setup\u003c\/li\u003e\n\u003c\/ul\u003e\n\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 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=\"https:\/\/benzunitedparts.com\/products\/custom-ecu-tuning-for-m278-4-7l-v8-biturbo-e550-cls550-s550-cl550-ml550\" style=\"color: #ff6b6b; font-weight: 700;\"\u003eAdd the M278 custom ECU tuning →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\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;\"\u003e2014–2017\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eS550 Sedan\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eW222\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;\"\u003e2015–2017\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eS550 Coupe\u003c\/td\u003e\n\u003ctd style=\"padding: 14px 16px; border: 1px solid #ddd;\"\u003eC217\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\u003cp style=\"font-size: 15px; color: #444; margin-bottom: 36px;\"\u003eConfirm your chassis code and engine before ordering. \u003cstrong\u003eNot sure?\u003c\/strong\u003e \u003ca href=\"mailto:benzunitedparts@gmail.com?subject=S550%20M278%20Downpipes%20Fitment%20Check\" style=\"color: #b30000; font-weight: 600;\"\u003eSend us your VIN\u003c\/a\u003e and we'll verify before you order.\u003c\/p\u003e\n\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\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, and \u003cstrong\u003e+118 hp \/ +190 lb-ft\u003c\/strong\u003e once paired with ECU calibration.\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\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=S550%20M278%20Downpipes%20Fitment%20Help\" style=\"color: #b30000; font-weight: 600;\"\u003eConfirm fitment or ask a question →\u003c\/a\u003e\u003c\/p\u003e\n\n\u003cp style=\"text-align: center; font-size: 14px; color: #555; font-weight: 600; letter-spacing: 0.3px;\"\u003eBenzUnited Parts • M278 S550 Downpipes • 12-Month Warranty • Ships Fast\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46717188669615,"sku":null,"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","url":"https:\/\/benzunitedparts.com\/products\/m278-catless-downpipes-mercedes-s550-w222-c217","provider":"BenzUnited Parts","version":"1.0","type":"link"}