{"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: 13px; color: #555; text-align: center; margin-bottom: 20px;\"\u003e\u003cstrong\u003eOff-road, track, 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\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\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\u003e+118 hp \/ +190 lb-ft\u003c\/strong\u003e — with these downpipes and ECU calibration\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 0 10px;\"\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\u003cp style=\"margin: 0;\"\u003e\u003ca href=\"https:\/\/benzunitedparts.com\/products\/amg-m278-4-7l-biturbo-intake-spacer-kit-e550-cls550-s550-cl550-sl550\" style=\"color: #ff6b6b; font-weight: 700;\"\u003eAdd the M278 intake spacer kit →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\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\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 engine, not just your badge\u003c\/p\u003e\n\u003cp style=\"margin: 0 0 10px; color: #5c4400;\"\u003e\u003cstrong\u003e2010–2011 E550 cars use the M273 5.5L naturally aspirated V8\u003c\/strong\u003e, not the M278 BiTurbo. These will not fit those cars. The M278 arrived for the 2012 model year.\u003c\/p\u003e\n\u003cp style=\"margin: 0; color: #5c4400;\"\u003eDriving an \u003cstrong\u003eE63 or CLS63 AMG\u003c\/strong\u003e? Those use the M157 5.5L BiTurbo and need the \u003ca href=\"https:\/\/benzunitedparts.com\/products\/mercedes-e63-cls63-m157-downpipes\" style=\"color: #b30000; font-weight: 700;\"\u003eM157 downpipes →\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\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. \u003cstrong\u003eNot sure?\u003c\/strong\u003e \u003ca href=\"mailto:benzunitedparts@gmail.com?subject=M278%20E550%20CLS550%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\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\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\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 E550 or CLS550?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes — a direct fit for the \u003cstrong\u003e2012–2016 W212 E550\u003c\/strong\u003e and \u003cstrong\u003e2012–2018 C218 CLS550\u003c\/strong\u003e with the M278 BiTurbo V8, in both rear-wheel drive and 4MATIC. They do not fit 2010–2011 E550 models, which use the naturally aspirated M273 5.5L 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;\"\u003eDo I need a tune?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; 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 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. Exact figures depend on your calibration 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;\"\u003eWill they work with aftermarket exhausts?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; 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: 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\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 style=\"margin-bottom: 36px;\"\u003e\u003ca href=\"mailto:benzunitedparts@gmail.com?subject=M278%20E550%20CLS550%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 Catless Downpipes • 12-Month Warranty • Ships Fast\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46717236871343,"sku":null,"price":749.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/m278-catless-downpipe-mid-pipe-section-e550-w212-cls550-c218.jpg?v=1784879104","url":"https:\/\/benzunitedparts.com\/products\/m278-catless-downpipes-mercedes-e550-w212-cls550-c218","provider":"BenzUnited Parts","version":"1.0","type":"link"}