{"title":"M278 Performance Parts for Mercedes E550 \/ CLS550 \/ S550 \/ SL550 \/ CL550","description":"\u003cdiv style=\"font-family: Arial, sans-serif; max-width: 980px; margin: 0 auto; line-height: 1.65; color: #222;\"\u003e\n\u003c!-- SEO H1 --\u003e\n\u003ch1 style=\"font-size: 28px; margin: 12px 0 18px;\"\u003eM278 Performance Parts \u0026amp; Upgrades for Mercedes-Benz E550 \/ CLS550 \/ S550 \/ SL550 \/ CL550\u003c\/h1\u003e\n\u003c!-- Keyword-Dense Intro --\u003e\n\u003cp style=\"font-size: 15px; margin-bottom: 16px;\"\u003eUnlock the full potential of your Mercedes-Benz \u003cstrong\u003eM278 4.7L BiTurbo V8\u003c\/strong\u003e with proven performance upgrades engineered for \u003cstrong\u003eE 550, CLS 550, S 550, SL 550, and CL 550\u003c\/strong\u003e models. Improve airflow, cooling, throttle response, longevity, and real-world acceleration with high-quality M278 parts tested across all 550 platforms.\u003c\/p\u003e\n\u003c!-- Main Body Content --\u003e\n\u003cp\u003eThe Mercedes-Benz \u003cstrong\u003eM278\u003c\/strong\u003e engine is one of the most capable and underrated modern V8s ever produced. Found in the 550-class models, this 4.7L twin-turbo works beautifully with the right supporting modifications. Whether your goal is sharper throttle response, more midrange torque, reduced heat soak, or improved reliability, these upgrades deliver measurable performance gains without sacrificing daily drivability.\u003c\/p\u003e\n\u003ch2 style=\"margin-top: 26px;\"\u003e🔥 Top Recommended M278 Upgrades\u003c\/h2\u003e\n\u003c!-- Product Grid --\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 22px; margin-top: 18px;\"\u003e\n\u003c!-- Spacer Kit --\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; border: 1px solid #ddd; padding: 16px; border-radius: 10px;\"\u003e\n\u003ch3 style=\"margin-top: 0;\"\u003eM278 Intake Filter Spacer Kit\u003c\/h3\u003e\n\u003cp\u003eImprove airflow efficiency, reduce restriction, and increase top-end breathing. A must-have for tuned or stock engines.\u003c\/p\u003e\n\u003ca style=\"display: inline-block; padding: 10px 18px; background: #111; color: #fff; border-radius: 8px; text-decoration: none; font-weight: bold;\" href=\"\/products\/m278-intake-filter-spacer-kit\"\u003eShop Spacer Kit →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c!-- ECU Tune --\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; border: 1px solid #ddd; padding: 16px; border-radius: 10px;\"\u003e\n\u003ch3 style=\"margin-top: 0;\"\u003eCustom ECU Tuning for M278\u003c\/h3\u003e\n\u003cp\u003eUnlock up to 300 lb-ft of hidden torque. Transform your E550, CLS550, or S550 with proper calibration.\u003c\/p\u003e\n\u003ca style=\"display: inline-block; padding: 10px 18px; background: #111; color: #fff; border-radius: 8px; text-decoration: none; font-weight: bold;\" href=\"\/products\/m278-ecu-tune\"\u003eShop ECU Tune →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c!-- Aluminum Intake Tubes --\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; border: 1px solid #ddd; padding: 16px; border-radius: 10px;\"\u003e\n\u003ch3 style=\"margin-top: 0;\"\u003eAluminum Intake Tubes – M278\u003c\/h3\u003e\n\u003cp\u003eReplace heat-soaked plastic tubes with high-flow aluminum for better temperature stability and durability.\u003c\/p\u003e\n\u003ca style=\"display: inline-block; padding: 10px 18px; background: #111; color: #fff; border-radius: 8px; text-decoration: none; font-weight: bold;\" href=\"\/products\/m278-aluminum-intake-tubes\"\u003eShop Intake Tubes →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c!-- Pulley Set --\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; border: 1px solid #ddd; padding: 16px; border-radius: 10px;\"\u003e\n\u003ch3 style=\"margin-top: 0;\"\u003e2-Piece Billet Aluminum Pulley Set\u003c\/h3\u003e\n\u003cp\u003eReduce rotational drag and improve belt stability with precision CNC-machined M278 pulleys.\u003c\/p\u003e\n\u003ca style=\"display: inline-block; padding: 10px 18px; background: #111; color: #fff; border-radius: 8px; text-decoration: none; font-weight: bold;\" href=\"\/products\/m278-billet-pulley-set\"\u003eShop Pulley Set →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c!-- Turbo Blankets --\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; border: 1px solid #ddd; padding: 16px; border-radius: 10px;\"\u003e\n\u003ch3 style=\"margin-top: 0;\"\u003eM278 Turbo Blankets – Heat Shield Upgrade\u003c\/h3\u003e\n\u003cp\u003eReduce underhood temps and improve turbo response with high-temp turbo insulation.\u003c\/p\u003e\n\u003ca style=\"display: inline-block; padding: 10px 18px; background: #111; color: #fff; border-radius: 8px; text-decoration: none; font-weight: bold;\" href=\"\/products\/m278-turbo-blankets\"\u003eShop Turbo Blankets →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c!-- Idler Set --\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; border: 1px solid #ddd; padding: 16px; border-radius: 10px;\"\u003e\n\u003ch3 style=\"margin-top: 0;\"\u003e5-Piece CNC Idler Pulley Set\u003c\/h3\u003e\n\u003cp\u003eQuiet operation, zero wobble, and long-term reliability. Superior to OEM replacements.\u003c\/p\u003e\n\u003ca style=\"display: inline-block; padding: 10px 18px; background: #111; color: #fff; border-radius: 8px; text-decoration: none; font-weight: bold;\" href=\"\/products\/m278-idler-pulley-set\"\u003eShop Idler Set →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c!-- Engine Mounts --\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; border: 1px solid #ddd; padding: 16px; border-radius: 10px;\"\u003e\n\u003ch3 style=\"margin-top: 0;\"\u003eBillet Polyurethane Engine Mounts\u003c\/h3\u003e\n\u003cp\u003eReduce drivetrain movement and improve throttle response without harsh NVH. Ideal for tuned M278 cars.\u003c\/p\u003e\n\u003ca style=\"display: inline-block; padding: 10px 18px; background: #111; color: #fff; border-radius: 8px; text-decoration: none; font-weight: bold;\" href=\"\/products\/m278-engine-mounts\"\u003eShop Engine Mounts →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Bottom Section --\u003e\n\u003ch2 style=\"margin-top: 36px;\"\u003eWhy Upgrade Your Mercedes 550 With M278 Mods?\u003c\/h2\u003e\n\u003cp\u003eThe M278 responds exceptionally well to airflow improvements, heat management upgrades, and optimized calibration. What starts as a quiet, refined luxury V8 becomes a torque-rich performance platform when supporting parts are added. All products in this collection are chosen for real-world gains, not hype.\u003c\/p\u003e\n\u003cp\u003eWhether you daily your E550, cruise your CLS550, or enjoy the comfort of an S550, these upgrades improve acceleration, responsiveness, and long-term reliability.\u003c\/p\u003e\n\u003c!-- Hidden SEO Tags --\u003e \u003cspan style=\"display: none;\"\u003e M278 performance parts, Mercedes 4.7L V8 biturbo upgrades, E550 performance parts, CLS550 turbo upgrade, S550 M278 tuning, SL550 performance mods, CL550 M278 upgrades, M278 intake spacer, M278 ECU tune, Mercedes twin turbo 4.7 upgrades, M278 aftermarket parts, Mercedes 550 performance \u003c\/span\u003e\n\u003c\/div\u003e","products":[{"product_id":"custom-ecu-tuning-for-m278-4-7l-v8-biturbo-e550-cls550-s550-cl550-ml550","title":"Custom ECU Tuning for M278 4.7L V8 BiTurbo E550 CLS550 S550 CL550 ML550","description":"\u003cdiv style=\"font-family: Arial, sans-serif; color: #333; line-height: 1.6; max-width: 820px; margin: auto;\"\u003e\n\u003c!-- SEO SUMMARY BLOCK --\u003e\n\u003cdiv style=\"display: flex; justify-content: space-between; text-align: center; font-size: 13px; margin: 15px 0; gap: 10px;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp style=\"text-align: center; font-size: 18px; font-weight: bold; color: #cc0000;\"\u003eUp to 541 HP and 751 lb-ft with safe, OEM-level calibration.\u003c\/p\u003e\n\u003c!-- INTRO --\u003e\n\u003cp style=\"font-size: 15px; text-align: justify;\"\u003eThis custom ECU tune unlocks the full potential of Mercedes’ \u003cstrong\u003eM278 4.7L BiTurbo\u003c\/strong\u003e, delivering massive increases in horsepower, torque, and throttle response while preserving factory safeguards. Designed specifically for E-Class, CLS-Class, S-Class, CL-Class, and ML-Class models equipped with the M278 engine.\u003c\/p\u003e\n\u003c!-- WHY TUNE --\u003e\n\u003ch3 style=\"color: #004aad; font-size: 18px; margin-top: 25px;\"\u003e💥 Key Benefits\u003c\/h3\u003e\n\u003cul style=\"font-size: 15px; margin-left: 20px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e+139 HP \/ +290 lb-ft:\u003c\/strong\u003e Among the highest proven gains for the M278 platform.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory Safety Retained:\u003c\/strong\u003e Knock control, fuel trims, boost protection, and temperature limits remain active.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSharper Response:\u003c\/strong\u003e Better throttle feel and stronger mid-range acceleration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull OEM Integration:\u003c\/strong\u003e No piggybacks — proper ECU calibration using factory-grade tools.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptional Mapping:\u003c\/strong\u003e Optimized versions available for downpipes, 93 octane, or supporting mods.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- COMPATIBILITY --\u003e\n\u003ch3 style=\"color: #004aad; font-size: 18px; margin-top: 25px;\"\u003e📌 Compatible Mercedes-Benz Models (M278 4.7L BiTurbo)\u003c\/h3\u003e\n\u003cul style=\"font-size: 15px; margin-left: 20px;\"\u003e\n\u003cli\u003e2012–2018 E550\u003c\/li\u003e\n\u003cli\u003e2012–2018 CLS550\u003c\/li\u003e\n\u003cli\u003e2012–2017 S550\u003c\/li\u003e\n\u003cli\u003e2012–2014 CL550\u003c\/li\u003e\n\u003cli\u003e2012–2015 ML550\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- HOW IT WORKS --\u003e\n\u003ch3 style=\"color: #004aad; font-size: 18px; margin-top: 25px;\"\u003e🔧 How the Process Works\u003c\/h3\u003e\n\u003cp style=\"font-size: 15px;\"\u003eYour ECU file is read, calibrated, and flashed using OEM-level equipment. Boost targets, ignition timing, torque limits, and fuel delivery are optimized for safe, consistent gains. No wiring, piggyback boxes, or unreliable modules.\u003c\/p\u003e\n\u003c!-- RESULTS --\u003e\n\u003ch3 style=\"color: #004aad; font-size: 18px; margin-top: 25px;\"\u003e🎯 Performance Gains\u003c\/h3\u003e\n\u003cul style=\"font-size: 15px; margin-left: 20px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eStock:\u003c\/strong\u003e ~402 HP \/ 516 lb-ft\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTuned:\u003c\/strong\u003e ~541 HP \/ 751 lb-ft\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal Gain:\u003c\/strong\u003e +139 HP \/ +290 lb-ft\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"font-size: 13px; color: #666;\"\u003eActual results vary based on fuel quality, altitude, and vehicle condition.\u003c\/p\u003e\n\u003c!-- CTA FOR M278 COLLECTION --\u003e\n\u003cdiv style=\"text-align: center; margin-top: 35px;\"\u003e\u003ca style=\"background: #004aad; color: #fff; padding: 12px 30px; border-radius: 5px; font-size: 16px; text-decoration: none; font-weight: bold;\" href=\"https:\/\/benzunitedparts.com\/collections\/m278-performance-parts-for-mercedes-e550-cls550-s550-sl550-cl550?_pos=1\u0026amp;_psq=m278\u0026amp;_ss=e\u0026amp;_v=1.0\"\u003e 🔥 Browse All M278 Performance Upgrades \u003c\/a\u003e\u003c\/div\u003e\n\u003c!-- FOOTER --\u003e\n\u003cdiv style=\"font-size: 13px; color: #666; margin-top: 30px; border-top: 1px solid #ccc; padding-top: 10px; text-align: center;\"\u003e\n\u003cp\u003e\u003cstrong\u003eBenzUnited Performance\u003c\/strong\u003e – Proven, Reliable Mercedes ECU Tuning\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":44575033721007,"sku":"BU-M278-TUNE","price":2500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/Imercedes-m278-engine-ecu-tuning-e550-cls550-s550.jpg?v=1764838188"},{"product_id":"12-18-mercedes-cls550-cls400-steel-braided-brake-line-kit-custom-colors-stainless-lines-for-c-class-w204-amg-copy-1","title":"2012-2018 Mercedes CLS550 \/ CLS400 C218 Stainless Steel Braided Brake Lines – Brake Line Upgrade Kit","description":"\u003cdiv style=\"font-family: Arial, sans-serif; color: #333; line-height: 1.6; padding: 20px; max-width: 800px; margin: auto; text-align: left;\"\u003e\n\u003c!-- TITLE + IMAGE --\u003e\n\u003ch2 style=\"text-align: center; color: #0056b3;\"\u003eStainless Steel Braided Brake Lines for Mercedes CLS550 (C218)\u003c\/h2\u003e\n\u003cp style=\"text-align: center; margin-bottom: 20px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/p0ara2c8.png?v=1732236468\" style=\"max-width: 100%; height: auto;\" alt=\"Mercedes CLS550 stainless steel braided brake line kit\"\u003e\u003c\/p\u003e\n\u003c!-- PERFORMANCE BOX --\u003e\n\u003cdiv style=\"border: 2px solid #ddd; padding: 15px; background-color: #f9f9f9; margin-bottom: 25px;\"\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cstrong\u003eUpgrade your CLS braking performance.\u003c\/strong\u003e OEM rubber hoses expand under pressure, creating inconsistent pedal feel—especially on heavier, high-torque vehicles like the Mercedes-Benz CLS550. Our stainless steel braided brake lines deliver sharper response, reduced fade, and improved braking precision.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- WHY BRAIDED --\u003e\n\u003ch2 style=\"color: #0056b3;\"\u003eWhy Choose Braided Brake Lines?\u003c\/h2\u003e\n\u003cul style=\"padding-left: 20px; margin: 0;\"\u003e\n\u003cli\u003e✔ Eliminates soft or spongy pedal feel under aggressive braking\u003c\/li\u003e\n\u003cli\u003e✔ Improves braking precision and stopping consistency\u003c\/li\u003e\n\u003cli\u003e✔ Increased durability using corrosion-resistant stainless steel\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- PERFORMANCE BUILD --\u003e\n\u003ch2 style=\"color: #0056b3;\"\u003eBuilt for Performance\u003c\/h2\u003e\n\u003cp\u003eEvery brake line kit is manufactured to exceed OEM standards and maintain consistent hydraulic pressure under heat and load.\u003c\/p\u003e\n\u003cul style=\"padding-left: 20px; margin-bottom: 25px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eStainless steel fittings:\u003c\/strong\u003e Prevent corrosion and ensure long-term reliability\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePTFE inner hose:\u003c\/strong\u003e Engineered for extreme pressure and temperature resistance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLifetime guarantee:\u003c\/strong\u003e Confidence in every braking situation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- FITMENT --\u003e\n\u003ch2 style=\"color: #0056b3;\"\u003eFitment\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e2012–2018 Mercedes-Benz CLS550 (C218)\u003c\/strong\u003e – 4.7L V8 BiTurbo (M278)\u003c\/p\u003e\n\u003c!-- COLORS --\u003e\n\u003ch2 style=\"color: #0056b3; text-align: center; margin-top: 20px;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/a9h697c8.png?v=1732166536\" style=\"max-width: 100%; height: auto;\" alt=\"Performance brake line color options\"\u003e \u003cbr\u003eChoose the Color That Matches Your Style\u003c\/h2\u003e\n\u003cp style=\"text-align: center; margin-bottom: 25px;\"\u003eAvailable in OEM-style black or a wide range of performance-inspired colors. Select your preferred finish at checkout.\u003c\/p\u003e\n\u003c!-- KIT INCLUDES --\u003e\n\u003ch2 style=\"color: #0056b3;\"\u003eKit Includes:\u003c\/h2\u003e\n\u003cul style=\"list-style: none; padding-left: 0; margin-bottom: 25px;\"\u003e\n\u003cli\u003e✔ 4 stainless steel braided brake lines (front + rear)\u003c\/li\u003e\n\u003cli\u003e✔ Stainless steel banjo bolts (if required)\u003c\/li\u003e\n\u003cli\u003e✔ Copper crush washers (if required)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- SPECS --\u003e\n\u003ch2 style=\"color: #0056b3;\"\u003eSpecifications:\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin-bottom: 25px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #ddd;\"\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ccc;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ccc;\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eLine Inner Material\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003ePTFE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eOuter Material\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eStainless steel braid with PVC coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eFittings\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e303\/304 stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eTemperature Range\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e-70°C to 260°C (-94°F to 500°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eInside Diameter\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e3.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eOutside Diameter\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e7.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eMax Working Pressure\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e290 Bar (4206 PSI)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eBurst Pressure\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e870 Bar (12618 PSI)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eMinimum Bend Radius\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e38mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"text-align: center; margin-bottom: 25px;\"\u003eDon’t settle for zinc-plated fittings that corrode. Our stainless-steel components provide long-term reliability and consistent braking performance.\u003c\/p\u003e\n\u003c!-- CTA --\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Black","offer_id":46380492751023,"sku":null,"price":150.0,"currency_code":"USD","in_stock":true},{"title":"Carbon","offer_id":46380492783791,"sku":null,"price":150.0,"currency_code":"USD","in_stock":true},{"title":"Red","offer_id":46380492816559,"sku":null,"price":150.0,"currency_code":"USD","in_stock":true},{"title":"Blue","offer_id":46380492849327,"sku":null,"price":150.0,"currency_code":"USD","in_stock":true},{"title":"Orange","offer_id":46380492882095,"sku":null,"price":150.0,"currency_code":"USD","in_stock":true},{"title":"Yellow","offer_id":46380492914863,"sku":null,"price":150.0,"currency_code":"USD","in_stock":true},{"title":"White","offer_id":46380492947631,"sku":null,"price":150.0,"currency_code":"USD","in_stock":true},{"title":"Kawasaki Green","offer_id":46380492980399,"sku":null,"price":150.0,"currency_code":"USD","in_stock":true},{"title":"Transparent Red","offer_id":46380493013167,"sku":null,"price":150.0,"currency_code":"USD","in_stock":true},{"title":"Transparent Purple","offer_id":46380493045935,"sku":null,"price":150.0,"currency_code":"USD","in_stock":true},{"title":"Transparent Blue","offer_id":46380493078703,"sku":null,"price":150.0,"currency_code":"USD","in_stock":true},{"title":"Transparent","offer_id":46380493111471,"sku":null,"price":150.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/mercedes-cls550-cls400-w218-stainless-braided-brake-lines-kit.jpg?v=1765365063"},{"product_id":"amg-m278-4-7l-biturbo-intake-spacer-kit-e550-cls550-s550-cl550-sl550","title":"Mercedes-Benz M278 Intake Filter Spacer Kit – 4.7L V8 BiTurbo E550, CLS550, S550, SL550","description":"\u003cdiv style=\"font-family: Arial, sans-serif; max-width: 900px; margin: 0 auto; line-height: 1.65; color: #222; font-size: 16px;\"\u003e\n\u003c!-- Lead --\u003e\n\u003cp\u003e\u003cstrong\u003eUnlock the airflow your 4.7L BiTurbo should have had from the factory.\u003c\/strong\u003e This CNC-machined \u003cstrong\u003eIntake Filter Spacer Kit\u003c\/strong\u003e for the \u003cstrong\u003eM278 (4.7L V8 BiTurbo)\u003c\/strong\u003e eliminates a known choke point inside the OEM airbox, improving airflow efficiency, sharpening throttle response, and giving the M278 a noticeably freer, stronger midrange — all while keeping a stock-clean engine bay.\u003c\/p\u003e\n\u003c!-- Key Features --\u003e\n\u003ch3 style=\"margin-top: 18px;\"\u003e🔥 Key Features for M278 Twin-Turbo V8\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduces the factory choke point:\u003c\/strong\u003e Lifts the filter into the optimal flow path, increasing effective inlet area and smoothing turbulence.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorks with OEM \u0026amp; high-flow filters:\u003c\/strong\u003e Fully compatible with Mercedes paper filters and all performance filter upgrades.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM engine cover compatible:\u003c\/strong\u003e Maintains a completely stock appearance — ideal for sleeper builds and inspection-safe mods.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC-machined aluminum:\u003c\/strong\u003e Heat-stable, corrosion-resistant, and precision-fit for every M278 airbox.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptional Cerakote finish:\u003c\/strong\u003e Available in stealth black or custom colors with engraving.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- Performance Benefits --\u003e\n\u003ch3 style=\"margin-top: 18px;\"\u003e📈 Real-World Benefits on M278 Models\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuicker turbo spool:\u003c\/strong\u003e Lower restriction means the turbos ramp up sooner and with less effort.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmoother, stronger midrange:\u003c\/strong\u003e Exactly where the M278 spends most of its time — daily driving, freeway pulls, and overtakes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMore headroom when tuned:\u003c\/strong\u003e Helps prevent airflow bottlenecks that show up on tuned 4.7L BiTurbo setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfect stealth mod:\u003c\/strong\u003e Hidden inside the airbox — zero visible changes under the hood.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNo tune required — fully compatible with stock ECU mapping.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003ca style=\"background: #0b6c3e; color: #fff; padding: 12px 28px; border-radius: 8px; font-weight: bold; text-decoration: none; font-size: 16px; display: inline-block;\" href=\"https:\/\/benzunitedparts.com\/products\/custom-ecu-tuning-for-m278-4-7l-v8-biturbo-e550-cls550-s550-cl550-ml550\"\u003e⚡ ECU Tuning — Optimized for Mods\u003c\/a\u003e\u003c\/p\u003e\n\u003c!-- CTA: Turbo Blankets (HOT SPOT PLACEMENT) --\u003e\u003c!-- Why It Works --\u003e\n\u003ch3 style=\"margin-top: 18px;\"\u003e🔬 Why the Spacer Works\u003c\/h3\u003e\n\u003cp\u003eThe factory M278 airbox has a restriction where the filter seals against the upper lid. At higher airflow levels, this lip becomes a bottleneck, increasing turbulence and reducing effective inlet area. Raising the filter slightly fixes this — improving compressor efficiency, airflow stability, and response under load.\u003c\/p\u003e\n\u003c!-- Compatibility Table --\u003e\n\u003ch3 style=\"margin-top: 18px;\"\u003e✔️ Compatibility – M278 4.7L BiTurbo V8\u003c\/h3\u003e\n\u003cp\u003eFits all Mercedes-Benz models equipped with the \u003cstrong\u003eM278 4.7L BiTurbo V8\u003c\/strong\u003e engine:\u003c\/p\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; text-align: left; margin: 14px 0; font-size: 15px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #f2f2f2;\"\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px;\"\u003eTrim\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px;\"\u003eYears\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;\"\u003eE-Class (W212)\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eE 550\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e2011–2016\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eCLS-Class (W218)\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eCLS 550\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e2012–2018\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eS-Class (W221\/W222)\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eS 550\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e2011–2017\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eSL-Class (R231)\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eSL 550\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e2013–2020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eCL-Class (C216)\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eCL 550\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e2011–2014\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eGL-Class (X166)\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eGL 450 \/ GL 550\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e2013–2016\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eGLS-Class (X166)\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eGLS 450 \/ GLS 550\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e2017–2019\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eML-Class (W166)\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eML 550\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e2012–2015\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eGLE-Class (W166)\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eGLE 450 \/ GLE 550\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e2016–2019\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size: 13px; color: #555;\"\u003eNote: Only fits \u003cstrong\u003eM278 4.7L V8 BiTurbo\u003c\/strong\u003e. Does not fit the M276 3.0L V6 found in some 450 models.\u003c\/p\u003e\n\u003cp style=\"font-size: 13px; color: rgb(85, 85, 85); text-align: center;\"\u003e\u003ca style=\"background: #0b6c3e; color: #fff; padding: 12px 28px; border-radius: 8px; font-weight: bold; text-decoration: none; font-size: 16px; display: inline-block;\" href=\"https:\/\/benzunitedparts.com\/products\/m278-turbo-blankets-heat-shield-upgrade-for-e550-cls550-s550\"\u003e ⚡ Turbo Blankets – Heat Shield Upgrade\u003c\/a\u003e\u003c\/p\u003e\n\u003c!-- CTA: ECU Tune (PLACED WHERE CUSTOMERS CHECK FITMENT → HIGH BUY INTENT) --\u003e\u003c!-- Install --\u003e\n\u003ch3 style=\"margin-top: 18px;\"\u003e🧰 Installation \u0026amp; Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBolt-on:\u003c\/strong\u003e Installs at the airbox\/filter interface with no cutting or modifications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM-style sealing:\u003c\/strong\u003e Maintains proper gasket compression around the filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDIY-friendly:\u003c\/strong\u003e Basic tools, 10–15 minutes per side.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- Included --\u003e\n\u003ch3 style=\"margin-top: 18px;\"\u003e📦 What’s Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e(2) CNC-machined aluminum intake spacers (left + right)\u003c\/li\u003e\n\u003cli\u003eDigital installation guide\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- Why Trust BenzUnited --\u003e\n\u003ch3 style=\"margin-top: 26px;\"\u003e🏁 Why Trust BenzUnited Performance Parts?\u003c\/h3\u003e\n\u003cp\u003eWe’ve spent over \u003cstrong\u003e12 years\u003c\/strong\u003e testing and tuning various Mercedes-Benz platforms. Our development process is based on real driving, data logging, and long-term ownership.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlatform expertise:\u003c\/strong\u003e We build upgrades specifically for Mercedes V8 turbo engines — not universal parts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo hype, no guesswork:\u003c\/strong\u003e If a mod doesn’t show improvement in throttle response, airflow stability, or real acceleration — we don’t sell it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM+ philosophy:\u003c\/strong\u003e Stealthy, reversible, reliability-focused upgrades that work in the real world.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- Professional Footer --\u003e\n\u003cdiv style=\"margin-top: 40px; background: #000; color: #fff; padding: 22px; text-align: center; font-size: 14px; border-radius: 6px;\"\u003eOur M278 upgrades are designed, tested, and refined by people who live and breathe these cars — ensuring performance you can feel, and reliability you can trust.\u003c\/div\u003e\n\u003c!-- SEO Tag Injection (hidden) --\u003e \u003cspan style=\"display: none;\"\u003e M278 intake spacer, M278 performance upgrade, Mercedes 4.7 biturbo airflow mod, E550 intake spacer, CLS550 intake mod, S550 airflow upgrade, GL550 performance, GLS550 intake upgrade, ML550 airflow mod, GLE550 intake upgrade, turbo blanket M278, M278 tuning, BenzUnited M278 upgrades \u003c\/span\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46284250808495,"sku":null,"price":150.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/m157-intake-airbox-filter-spacer-top-view.png?v=1770786858"},{"product_id":"m278-amg-aluminum-intake-tubes-w212-w218-e550-cls550-upgrade-kit","title":"M278 Aluminum Intake Tubes – W212 W218 E550 CLS550 Upgrade Kit","description":"\u003cp\u003e\u003cstrong\u003eLet your M278 4.7L V8 BiTurbo breathe the way it was meant to.\u003c\/strong\u003e These CNC-bent \u003cstrong\u003ealuminum intake tubes\u003c\/strong\u003e replace the restrictive OEM plastic pipes on \u003cstrong\u003eW212 \/ W218 \/ W207 \/ C207 550 models\u003c\/strong\u003e — improving airflow, throttle response, and turbo efficiency while keeping a clean OEM+ engine bay appearance.\u003c\/p\u003e\n\n\u003cp\u003eThe stock plastic intake tubes on the M278 4.7L V8 were built for refinement, not maximum flow. Under heat and boost they can soften and distort, disrupting airflow before the turbochargers. These aluminum tubes give your E550, CLS550, or E-Class coupe\/cabriolet a smoother, more efficient inlet path that supports tuning, harder driving, and repeatable performance.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-flow aluminum construction:\u003c\/strong\u003e rigid tubing that won't crack, flex, or deform under heat and boost like aged plastic.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmoother turbo inlet airflow:\u003c\/strong\u003e reduces turbulence and pressure drop before the turbos.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotorsport-grade silicone couplers:\u003c\/strong\u003e heat-resistant and boost-rated for stock or tuned M278 applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect-fit engineering:\u003c\/strong\u003e designed around factory airboxes and turbo inlets — no cutting or permanent modifications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptional Cerakote thermal finish:\u003c\/strong\u003e helps control radiant heat and improve intake air temperature stability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM+ stealth appearance:\u003c\/strong\u003e clean routing that blends into the engine bay of any E550 or CLS550.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eReal-World Performance Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSharper throttle response:\u003c\/strong\u003e faster, more stable airflow as you roll into boost.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStronger midrange torque:\u003c\/strong\u003e better volumetric efficiency where the 4.7L biturbo makes its power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMore consistent performance:\u003c\/strong\u003e less heat soak and smoother airflow for repeatable acceleration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupports tuning and bolt-ons:\u003c\/strong\u003e ideal alongside ECU tunes, intake spacers, high-flow filters, and cooling upgrades.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFitment Compatibility (M278 4.7L BiTurbo, Non-AMG)\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eChassis\u003c\/th\u003e\n\u003cth\u003eModel\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\u003eW212\u003c\/td\u003e\n\u003ctd\u003eE550 Sedan\u003c\/td\u003e\n\u003ctd\u003e2012–2016\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eW218\u003c\/td\u003e\n\u003ctd\u003eCLS550\u003c\/td\u003e\n\u003ctd\u003e2012–2018\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eW207 \/ C207\u003c\/td\u003e\n\u003ctd\u003eE550 Coupe \/ Cabriolet\u003c\/td\u003e\n\u003ctd\u003e2012–2017\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDirect bolt-on replacement for OEM plastic intake tubes.\u003c\/li\u003e\n\u003cli\u003eInstall time: ~45–90 minutes with basic hand tools.\u003c\/li\u003e\n\u003cli\u003eCompatible with OEM airboxes and high-flow panel filters.\u003c\/li\u003e\n\u003cli\u003eNo tune required — works with stock ECU calibration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLeft \u0026amp; right CNC-bent aluminum intake tubes (M278-specific)\u003c\/li\u003e\n\u003cli\u003eHigh-temp silicone couplers\u003c\/li\u003e\n\u003cli\u003eStainless T-bolt clamps\u003c\/li\u003e\n\u003cli\u003eOptional Cerakote thermal coating (if selected)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRecommended Supporting Mods\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/benzunitedparts.com\/products\/m278-intake-filter-spacer-kit\"\u003eM278 Intake Filter Spacer Kit →\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/benzunitedparts.com\/products\/custom-ecu-tuning-m278-4-7-biturbo\"\u003eCustom ECU Tuning for M278 4.7L BiTurbo →\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/benzunitedparts.com\/products\/m278-turbo-blankets\"\u003eM278 Turbo Blankets \u0026amp; Heat Management →\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eBuilt \u0026amp; Tested by BenzUnited\u003c\/h3\u003e\n\u003cp\u003eWe've spent over 12 years daily-driving, tuning, and refining Mercedes-Benz 550 and AMG platforms. Every upgrade we produce is tested in-house across real mileage, real heat, and real boost — not just theoretical dyno curves. That's why our hardware fits, lasts, and performs where it matters: on the road.\u003c\/p\u003e\n\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 — we 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\u003e\u003ca href=\"mailto:benzunitedparts@gmail.com?subject=M278%20Intake%20Tubes%20Fitment%20Help\"\u003eConfirm fitment or ask a question →\u003c\/a\u003e\u003c\/p\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46284912459951,"sku":"INTK-M278-W212-W218","price":275.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/w212-w218-m278-aluminum-intake-tubes-installed-engine-bay.jpg?v=1763430626"},{"product_id":"5-piece-idler-pulley-set-billet-upgrade-for-m278-v8-bi-turbo","title":"5-Piece Idler Pulley Set – Billet Upgrade for M278 V8 Bi-Turbo","description":"\u003cdiv style=\"font-family: Arial, sans-serif; max-width: 900px; margin: auto; line-height: 1.65; color: #222; font-size: 16px;\"\u003e\n\u003c!-- Lead --\u003e\n\u003cp\u003eRestore and upgrade the belt system on your \u003cstrong\u003eM278 4.7L BiTurbo V8\u003c\/strong\u003e with this complete \u003cstrong\u003e5-Piece Billet Aluminum Idler Pulley Set\u003c\/strong\u003e. The factory plastic and aging stamped-steel pulleys on the E 550, CLS 550, S 550, SL 550, and other M278-equipped models are prone to wear, noise, and failure—especially as mileage rises or when the engine is tuned. This kit replaces them with \u003cstrong\u003eCNC-machined billet pulleys\u003c\/strong\u003e engineered for reliability, smooth operation, and long-term durability.\u003c\/p\u003e\n\u003c!-- Why It Matters --\u003e\n\u003cp style=\"margin-top: 10px;\"\u003eThe OEM idler pulleys on the \u003cstrong\u003eM278 4.7L V8 BiTurbo\u003c\/strong\u003e develop play, bearing noise, belt slip, and wobble over time. On a twin-turbo V8, even minor belt irregularities can cause \u003cstrong\u003eboost inconsistencies, charging issues, accessory failures, or catastrophic belt breakage\u003c\/strong\u003e. Upgrading to billet aluminum eliminates these weak points and stabilizes the engine’s entire accessory drive system.\u003c\/p\u003e\n\u003c!-- Key Features --\u003e\n\u003ch3 style=\"margin-top: 20px;\"\u003e🔧 Key Features – Billet Idler Pulley Set for M278\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC-machined 6061-T6 billet aluminum:\u003c\/strong\u003e Significantly stronger than OEM plastic or steel pulleys.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHard-anodized surface:\u003c\/strong\u003e Provides corrosion resistance and long-term bearing stability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium high-speed bearings:\u003c\/strong\u003e Quiet, smooth rotation with improved temperature tolerance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull 5-piece belt path refresh:\u003c\/strong\u003e Replaces all major M278 idlers for a complete system overhaul.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect bolt-on installation:\u003c\/strong\u003e Fits in place of factory pulleys with no modifications required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproves belt tracking:\u003c\/strong\u003e Reduces slip at higher loads and improves boost consistency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in the USA:\u003c\/strong\u003e Precision-manufactured to motorsport-grade tolerances.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- Performance \u0026 Reliability Benefits --\u003e\n\u003ch3 style=\"margin-top: 20px;\"\u003e📈 Performance \u0026amp; Reliability Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEliminates OEM pulley failure points\u003c\/strong\u003e that become common past 60k–100k miles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduces belt noise, squeal, and vibration\u003c\/strong\u003e for smoother accessory operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupports tuned M278 engines\u003c\/strong\u003e running increased boost or upgraded coolers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStabilizes boost control\u003c\/strong\u003e by preventing belt slip under acceleration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtends belt life\u003c\/strong\u003e by using precise billet alignment and higher-quality bearings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- What's Included --\u003e\n\u003ch3 style=\"margin-top: 20px;\"\u003e📦 What’s Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e(5) CNC-machined billet aluminum idler pulleys (complete M278 set)\u003c\/li\u003e\n\u003cli\u003ePre-installed high-speed performance bearings\u003c\/li\u003e\n\u003cli\u003eOEM-spec mounting hardware (as required)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- Compatibility Table --\u003e\n\u003ch3 style=\"margin-top: 22px;\"\u003e✔️ Compatibility – M278 4.7L V8 BiTurbo\u003c\/h3\u003e\n\u003cp\u003eFits the following Mercedes-Benz models equipped with the \u003cstrong\u003eM278 4.7L BiTurbo V8\u003c\/strong\u003e:\u003c\/p\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 10px 0 14px; font-size: 15px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\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;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ddd; padding: 8px; text-align: left;\"\u003eYears (Approx.)\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;\"\u003eW212\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eE 550\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e2012–2016\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eW218\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eCLS 550\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e2012–2018\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eW221 \/ W222\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eS 550\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e2011–2017\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eR231\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eSL 550\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e2013–2020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eX166\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eGL 550 \/ GLS 550\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e2013–2019\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eW166\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eML 550 \/ GLE 550\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e2012–2019\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size: 13px; color: #555; margin: 0 0 12px;\"\u003e*Some markets vary. If you’re unsure whether your Mercedes uses the M278 engine, send us your \u003cstrong\u003eVIN\u003c\/strong\u003e and we’ll confirm fitment before shipping.\u003c\/p\u003e\n\u003c!-- Recommended Mods --\u003e\n\u003cdiv style=\"margin-top: 20px; padding: 14px 16px; border-radius: 8px; border: 1px solid #eee; background: #f7f7f7;\"\u003e\n\u003cp style=\"margin: 0 0 8px;\"\u003e\u003cstrong\u003eRecommended supporting upgrades for the M278 4.7L BiTurbo:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul style=\"margin: 0 0 4px 18px;\"\u003e\n\u003cli\u003e\u003ca href=\"\/products\/m278-aluminum-intake-tubes\" style=\"color: #000; font-weight: bold; text-decoration: none;\"\u003e M278 Aluminum Intake Tubes \u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/m278-intake-filter-spacer-kit\" style=\"color: #000; font-weight: bold; text-decoration: none;\"\u003e M278 Intake Filter Spacer Kit \u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/custom-ecu-tuning-m278-4-7-biturbo\" style=\"color: #000; font-weight: bold; text-decoration: none;\"\u003e Custom ECU Tuning for M278 4.7L BiTurbo \u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/m278-turbo-blankets\" style=\"color: #000; font-weight: bold; text-decoration: none;\"\u003e M278 Turbo Blankets \u0026amp; Heat Management \u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- Installation --\u003e\n\u003ch3 style=\"margin-top: 20px;\"\u003e🧰 Installation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDirect bolt-on replacement for all M278 idler pulley locations.\u003c\/li\u003e\n\u003cli\u003eTypical install time: 1–2 hours.\u003c\/li\u003e\n\u003cli\u003eNo tuning or reprogramming required.\u003c\/li\u003e\n\u003cli\u003eWorks with OEM and upgraded belt configurations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- Trust Section --\u003e\n\u003ch3 style=\"margin-top: 26px;\"\u003e🏁 Designed, Tested \u0026amp; Proven on M278 Platforms\u003c\/h3\u003e\n\u003cp style=\"margin-top: 0;\"\u003eWith over \u003cstrong\u003e12 years\u003c\/strong\u003e of hands-on experience tuning and daily-driving Mercedes-Benz V8 BiTurbo engines, we know exactly where the M278 benefits from stronger hardware. This pulley set is built to meet the demands of real-world heat, boost, and mileage—offering a durable solution that improves reliability and performance across all 4.7L BiTurbo platforms.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46285619953839,"sku":"BU-M278-IDL-SET5","price":540.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/5-piece-idler-pulley-set-m278-billet-upgrade.jpg?v=1763435434"},{"product_id":"m278-turbo-blankets-heat-shield-upgrade-for-e550-cls550-s550","title":"M278 Turbo Blankets – Heat Shield Upgrade for E550 CLS550 S550","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\u003ch2 style=\"color: #003366; text-align: center;\"\u003eReduce Heat Soak \u0026amp; Improve Turbo Response on Your Mercedes-Benz\u003c\/h2\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.7;\"\u003eUnlock consistent, repeatable performance from your \u003cstrong\u003eMercedes-Benz M278 4.7L BiTurbo\u003c\/strong\u003e with our premium \u003cstrong\u003eM278 Turbo Blankets\u003c\/strong\u003e. Engineered specifically for the twin-turbo 550 platform, these blankets retain heat inside the turbine housing to improve spool, reduce under-hood temperatures, and protect surrounding components under high load.\u003c\/p\u003e\n\u003ch3 style=\"color: #003366;\"\u003e🔥 Key Benefits\u003c\/h3\u003e\n\u003cul style=\"font-size: 16px; line-height: 1.7; margin-left: 18px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eUp to 60% reduction in radiant heat\u003c\/strong\u003e for lower IATs and more stable power delivery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved turbo response\u003c\/strong\u003e by retaining exhaust energy inside the turbine housing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced heat soak\u003c\/strong\u003e to charge-coolers, wiring, vacuum lines, and nearby engine components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMore reliable performance\u003c\/strong\u003e during repeated acceleration or high-temperature conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced long-term durability\u003c\/strong\u003e thanks to significantly lower engine bay temperatures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium construction:\u003c\/strong\u003e volcanic rock fiber exterior (1800°F direct \/ 2500°F radiant), stainless mesh reinforcement, and CMS wool insulation (1832°F continuous).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"color: #003366;\"\u003e🚗 Vehicle Fitment – M278 4.7L BiTurbo (550 Series)\u003c\/h3\u003e\n\u003cul style=\"font-size: 16px; line-height: 1.7; margin-left: 18px;\"\u003e\n\u003cli\u003eMercedes-Benz S550 (2011–2017)\u003c\/li\u003e\n\u003cli\u003eMercedes-Benz CL550 (2011–2014)\u003c\/li\u003e\n\u003cli\u003eMercedes-Benz CLS550 (2012–2018)\u003c\/li\u003e\n\u003cli\u003eMercedes-Benz E550 (2012–2016)\u003c\/li\u003e\n\u003cli\u003eMercedes-Benz ML550 (2012–2015)\u003c\/li\u003e\n\u003cli\u003eMercedes-Benz GLE550 (2016–2019)\u003c\/li\u003e\n\u003cli\u003eMercedes-Benz GL550 (2012–2015)\u003c\/li\u003e\n\u003cli\u003eMercedes-Benz GLS550 (2016–2019)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"color: #003366;\"\u003e💡 Why Upgrade?\u003c\/h3\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.7;\"\u003eTurbo blankets are one of the most effective, low-cost upgrades for the \u003cstrong\u003eM278 BiTurbo\u003c\/strong\u003e platform. By containing heat within the turbine housing, exhaust velocity remains high—improving turbo efficiency and reducing heat soak across the engine bay. This results in \u003cstrong\u003elower intake temperatures, faster turbo response, and improved long-term reliability\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cdiv style=\"background-color: #eef3f8; border-left: 4px solid #003366; padding: 16px; margin-top: 20px; text-align: center;\"\u003e\n\u003cstrong\u003eMaximize your Mercedes-Benz 550’s performance.\u003c\/strong\u003e Reduce heat, protect components, and unlock consistent power with the \u003cem\u003eM278 Turbo Blanket Upgrade\u003c\/em\u003e.\u003c\/div\u003e\n\u003cdiv style=\"text-align: center; margin-top: 25px;\"\u003e\u003ca href=\"https:\/\/benzunitedparts.com\/products\/m278-turbo-blankets\" style=\"background-color: #004aad; color: #fff; padding: 12px 22px; border-radius: 6px; text-decoration: none; font-size: 16px; font-weight: bold;\"\u003eMore M278 Performance Mods \u003c\/a\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46293412184239,"sku":null,"price":245.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/m278-turbo-blankets-heat-shield-upgrade.png?v=1763520517"},{"product_id":"m278-2-piece-billet-aluminum-pulley-set-for-mercedes-e550-cls550","title":"M278 2-Piece Billet Aluminum Pulley Set – E550 \/ CLS550 \/ S550","description":"\u003cdiv style=\"max-width: 920px; margin: 0 auto; font-family: Arial, Helvetica, sans-serif; line-height: 1.65; color: #222; font-size: 16px; background: #fff;\"\u003e\n\u003cp style=\"text-align: center; background: #f8f8f8; padding: 14px; border-radius: 8px; font-size: 17px;\"\u003e\u003cstrong\u003ePrecision billet upgrade\u003c\/strong\u003e that reduces belt slip, eliminates noise, and gives smoother, sharper response on every tuned or hard-driven M278.\u003c\/p\u003e\n\u003chr style=\"border: none; height: 2px; background: linear-gradient(to right, #eee, #d32f2f, #eee); margin: 25px 0;\"\u003e\n\u003ch2 style=\"color: #000; text-align: center; font-size: 26px; margin: 25px 0 15px;\"\u003eWhy This Billet Pulley Set Makes a Real Difference on the M278\u003c\/h2\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 15px; justify-content: center;\"\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; background: #f9f9f9; padding: 16px; border-radius: 8px;\"\u003e\n\u003cstrong\u003e✅ Aerospace Billet Aluminum + Hard Anodized\u003c\/strong\u003e\u003cbr\u003eCNC-machined for zero flex and maximum strength under boost.\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; background: #f9f9f9; padding: 16px; border-radius: 8px;\"\u003e\n\u003cstrong\u003e✅ Premium Nachi ZZ Bearings\u003c\/strong\u003e\u003cbr\u003eUltra-quiet, high-speed bearings that eliminate belt chirp and last for years.\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; background: #f9f9f9; padding: 16px; border-radius: 8px;\"\u003e\n\u003cstrong\u003e✅ Perfect Bolt-On Fit\u003c\/strong\u003e\u003cbr\u003eDirect replacement using factory brackets — no modifications, installs in under 60 minutes.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"margin: 28px 0 12px; color: #d32f2f; text-align: center;\"\u003eReal-World Results Owners Report\u003c\/h3\u003e\n\u003cul style=\"font-size: 16.5px; max-width: 680px; margin: 0 auto;\"\u003e\n\u003cli\u003eSmoother revs and noticeably sharper throttle response\u003c\/li\u003e\n\u003cli\u003eEliminated belt squeal and improved belt tracking under load\u003c\/li\u003e\n\u003cli\u003eBetter consistency when the turbos are spooled on tuned cars\u003c\/li\u003e\n\u003cli\u003eZero vibration even at redline • Made in USA quality you can feel\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-align: center; font-size: 15px; font-style: italic; margin: 20px 0;\"\u003e“The difference in smoothness and belt noise is night and day on my tuned E550. These pulleys are the first thing I recommend after downpipes.” – Alex R., 2015 CLS550 • 512 whp\u003c\/p\u003e\n\u003ch3 style=\"margin-top: 30px; text-align: center;\"\u003eWhat You Get (Complete 2-Piece Kit)\u003c\/h3\u003e\n\u003cul style=\"text-align: center; list-style: none; padding: 0; font-size: 17px;\"\u003e\n\u003cli\u003e✔ 2 × Precision CNC Billet Aluminum Pulleys (hard anodized)\u003c\/li\u003e\n\u003cli\u003e✔ High-Speed Nachi ZZ Bearings pre-installed\u003c\/li\u003e\n\u003cli\u003e✔ All necessary stainless hardware + install guide\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin-top: 28px; color: #000; text-align: center;\"\u003eFits These M278 4.7L BiTurbo Models\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; background: #f9f9f9;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #222; color: #fff;\"\u003e\n\u003cth style=\"padding: 12px; text-align: left;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left;\"\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px;\"\u003eE 550 • CLS 550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003eW212 \/ C218\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003e2012–2016 \/ 2012–2018\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #fff;\"\u003e\n\u003ctd style=\"padding: 10px;\"\u003eS 550 • CL 550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003eW221 • W222 • C216\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003e2011–2017\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px;\"\u003eSL 550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003eR231\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003e2013–2018\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #fff;\"\u003e\n\u003ctd style=\"padding: 10px;\"\u003eGL \/ GLS 550 • ML \/ GLE 550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003eX166 • W166\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003e2012–2019\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size: 13px; text-align: center; color: #666; margin: 8px 0 0;\"\u003e✅ Confirmed for all M278 4.7L BiTurbo engines • Message if unsure\u003c\/p\u003e\n\u003ch3 style=\"margin: 34px 0 14px; text-align: center;\"\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 I need a tune for these?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eNo. These are a direct replacement for the factory pulleys — no ECU changes required. They're a supporting\/reliability upgrade rather than a standalone power adder.\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 fix my belt squeal?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eThat's one of the main reasons people buy them. The high-speed Nachi ZZ bearings and zero-flex billet construction address belt chirp and poor belt tracking under load — common complaints on higher-mileage or tuned M278s.\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 the install take?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eUnder 60 minutes. It bolts on using the factory brackets — no cutting or modification, and all necessary stainless hardware plus an install guide are included.\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 confirm it fits my car?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eConfirm your car has the M278 4.7L biturbo V8 — the engine code decides fitment, not the badge. Covered chassis are listed in the table above. If you're unsure, message us your year, model, and VIN and we'll confirm before you order.\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 in the kit?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eTwo CNC billet aluminum pulleys (hard anodized) with the Nachi ZZ bearings already pressed in, plus all required stainless hardware and an install guide.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdiv style=\"text-align: center; margin: 32px 0 20px;\"\u003e\n\u003cp style=\"font-size: 17px;\"\u003e\u003cstrong\u003eInstall in under 60 minutes • Bolt-on using factory brackets • No cutting or mods\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp style=\"text-align: center; margin-top: 25px; font-size: 13px; color: #777;\"\u003eBenzUnited Parts • Mercedes Performance Specialist • Ships from USA\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46294269001903,"sku":"BU-M278-PUL-2PC","price":230.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/m278-billet-pulley-set-cnc-performance-upgrade.jpg?v=1763530311"},{"product_id":"m278-billet-polyurethane-engine-mounts-e550-cls550","title":"M278 Billet Polyurethane Engine Mounts – E550 \/ CLS550","description":"\u003cdiv style=\"font-family: Arial, sans-serif; max-width: 880px; margin: auto; padding: 22px; border: 1px solid #e5e7eb; background: #fafafa; color: #1a1a1a; line-height: 1.7; border-radius: 10px;\"\u003e\n\u003c!-- TITLE \/ HOOK --\u003e\n\u003ch1 style=\"text-align: center; font-size: 26px; margin: 0 0 8px; color: #0b3b60;\"\u003eBillet \/ Polyurethane Engine Mounts for Mercedes M278 (W212 \/ W218)\u003c\/h1\u003e\n\u003cp style=\"text-align: center; margin: 0 0 18px; color: #475569;\"\u003eReduce drivetrain motion • Sharpen throttle response • Improve power delivery\u003c\/p\u003e\n\u003c!-- INTRO --\u003e\n\u003cp\u003eUpgrade your \u003cstrong\u003eMercedes-Benz M278 4.7L BiTurbo\u003c\/strong\u003e with our \u003cstrong\u003eBillet \/ Polyurethane Engine Mounts\u003c\/strong\u003e. Designed specifically for the \u003cstrong\u003eW212 E 550\u003c\/strong\u003e and \u003cstrong\u003eW218 CLS 550\u003c\/strong\u003e, these mounts deliver superior engine control, sharper response, and consistent power transfer under load — ideal for tuned or spiritedly driven 550 builds.\u003c\/p\u003e\n\u003cp\u003eFactory fluid-filled mounts on M278 cars \u003cstrong\u003esag, leak, and collapse with age\u003c\/strong\u003e, especially on tuned cars or those driven hard. The result is excess engine movement, sloppy shifts, and vibration under throttle. These billet\/poly mounts eliminate that failure point with a rigid housing and high-durometer insert that keep everything locked in place.\u003c\/p\u003e\n\u003c!-- KEY BENEFITS --\u003e\n\u003ch2 style=\"color: #0b3b60; margin-top: 18px;\"\u003e⚙️ Key Benefits\u003c\/h2\u003e\n\u003cul style=\"margin-left: 20px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eStability \u0026amp; Control:\u003c\/strong\u003e Reduces engine movement and drivetrain lash for sharper throttle response and cleaner shifts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable by Design:\u003c\/strong\u003e Billet aluminum housings and high-durometer polyurethane resist heat, oil, and deformation far better than OEM fluid-filled mounts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved Torque Transfer:\u003c\/strong\u003e Keeps the drivetrain aligned under boost so more of the M278’s torque reaches the rear wheels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistent Geometry:\u003c\/strong\u003e Prevents the front end from “sagging” as mounts age, helping maintain proper driveline and exhaust alignment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect-Fit Upgrade:\u003c\/strong\u003e Engineered around factory mount geometry for a precise, bolt-in installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- FITMENT --\u003e\n\u003ch2 style=\"color: #0b3b60; margin-top: 22px;\"\u003e✅ Vehicle Fitment — M278 (W212 \/ W218)\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; margin-top: 8px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #0b3b60; color: #fff;\"\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #e5e7eb; text-align: left;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #e5e7eb; text-align: left;\"\u003eEngine\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #e5e7eb; text-align: left;\"\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background: #f1f5f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003eE 550 (W212)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003eM278 4.7L BiTurbo\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e2012–2016\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003eCLS 550 (W218)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003eM278 4.7L BiTurbo\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e5e7eb;\"\u003e2012–2018\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size: 13px; color: #64748b; margin-top: 8px;\"\u003e\u003cem\u003eFitment is exclusive to the W212 and W218 M278 platforms. Contact us with your VIN if you’re unsure.\u003c\/em\u003e\u003c\/p\u003e\n\u003c!-- WHAT'S INCLUDED \/ INSTALL --\u003e\n\u003ch2 style=\"color: #0b3b60; margin-top: 22px;\"\u003e📦 What’s Included \u0026amp; Install Notes\u003c\/h2\u003e\n\u003cul style=\"margin-left: 20px;\"\u003e\n\u003cli\u003eLeft + Right \u003cstrong\u003eBillet \/ Polyurethane Engine Mounts\u003c\/strong\u003e for M278 W212\/W218.\u003c\/li\u003e\n\u003cli\u003eReuse the \u003cstrong\u003eOEM top cap\u003c\/strong\u003e (pops off the factory mount with a small screwdriver).\u003c\/li\u003e\n\u003cli\u003eDirect-fit design matches factory geometry for proper drivetrain and exhaust alignment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"font-size: 14px; color: #475569;\"\u003e\u003cem\u003eProfessional installation recommended. Torque all fasteners to factory specification and verify downpipe, subframe, and steering rack clearance after installation.\u003c\/em\u003e\u003c\/p\u003e\n\u003c!-- FAQ --\u003e\n\u003ch2 style=\"color: #0b3b60; margin-top: 22px;\"\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails style=\"margin-bottom: 10px;\"\u003e\n\u003csummary\u003e\u003cstrong\u003eWill these increase NVH?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp style=\"margin-top: 6px;\"\u003eCompared to soft OEM fluid-filled mounts, you may notice a slight increase in vibration at idle or low RPM. Under load, most drivers prefer the added precision, improved drivetrain feel, and reduction in “slop” when getting on and off throttle.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 10px;\"\u003e\n\u003csummary\u003e\u003cstrong\u003eAre these mounts suitable for tuned or high-boost M278 cars?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp style=\"margin-top: 6px;\"\u003eYes. The billet housings and high-durometer polyurethane inserts are designed to handle the elevated torque, heat, and repeated load cycles typical of tuned W212\/W218 M278 builds.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 10px;\"\u003e\n\u003csummary\u003e\u003cstrong\u003eDo I need new hardware?\u003c\/strong\u003e\u003c\/summary\u003e\n\u003cp style=\"margin-top: 6px;\"\u003eOEM hardware may be reused if it’s in good condition. Replace any stretched, corroded, or damaged bolts and always follow factory torque and angle specs.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c!-- CTA --\u003e\n\u003cdiv style=\"text-align: center; margin-top: 24px;\"\u003e\u003ca href=\"\/collections\/m278\" style=\"display: inline-block; background: #0b3b60; color: #fff; padding: 12px 22px; border-radius: 8px; text-decoration: none; font-weight: bold;\"\u003e 🔧 Shop M278 Performance Parts \u003c\/a\u003e\u003c\/div\u003e\n\u003c!-- SEO FOOTER LINE --\u003e\n\u003cp style=\"text-align: center; font-size: 13px; color: #64748b; margin-top: 18px;\"\u003ePerformance engine mounts for Mercedes E 550 \u0026amp; CLS 550 — W212 \/ W218 M278 4.7L BiTurbo.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46294562242735,"sku":"BU-M278-MNT-BILLET","price":495.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/billet-polyurethane-engine-mounts-mercedes-m278-e550-cls550-benzunited.jpg?v=1763534145"},{"product_id":"mercedes-benz-m278-intake-filter-spacer-kit-4-7l-v8-biturbo-e550-cls550-s550-sl550-copy","title":"M278 Intake Spacer Kit + aFe Magnum FLOW Pro 5R Filters (E550 \/ CLS550 \/ S550)","description":"\u003cdiv style=\"max-width: 920px; margin: 0 auto; font-family: Arial, Helvetica, sans-serif; line-height: 1.65; color: #222; font-size: 16px; background: #fff;\"\u003e\n\u003cp style=\"text-align: center; font-size: 18px; font-weight: bold; margin: 12px 0 16px;\"\u003eThe smartest OEM+ upgrade for every tuned E550 \/ CLS550 \/ S550 \/ GL550 on the M278 4.7L BiTurbo\u003c\/p\u003e\n\u003cp style=\"text-align: center; background: #f8f8f8; padding: 14px; border-radius: 8px; font-size: 17px;\"\u003e\n\u003cstrong\u003eFix the hidden airbox restriction\u003c\/strong\u003e your headers, tune, and downpipes are already begging for.\n\u003c\/p\u003e\n\u003chr style=\"border: none; height: 2px; background: linear-gradient(to right, #eee, #d32f2f, #eee); margin: 25px 0;\"\u003e\n\u003ch2 style=\"color: #000; text-align: center; font-size: 26px; margin: 25px 0 15px;\"\u003eWhy This Magnum FLOW OE Combo Actually Works on the M278\u003c\/h2\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 15px; justify-content: center;\"\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; background: #f9f9f9; padding: 16px; border-radius: 8px;\"\u003e\n\u003cstrong\u003e✅ Airbox Spacer (Left + Right)\u003c\/strong\u003e\u003cbr\u003eRaises the filter sealing plane → smoother, higher-volume airflow into the MAF housing.\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; background: #f9f9f9; padding: 16px; border-radius: 8px;\"\u003e\n\u003cstrong\u003e✅ aFe Magnum FLOW OE Replacement Air Filter w\/ Pro 5R Media\u003c\/strong\u003e\u003cbr\u003eMaximum-flow oiled cotton gauze (noticeably more airflow than Pro Dry S), reusable, perfect MAF compatibility.\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; background: #f9f9f9; padding: 16px; border-radius: 8px;\"\u003e\n\u003cstrong\u003e✅ Factory Airbox Stays 100% Stock\u003c\/strong\u003e\u003cbr\u003eKeeps perfect cold-air routing and heat shields — no heat-soak like open intakes.\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"margin: 28px 0 12px; color: #d32f2f; text-align: center;\"\u003eReal-World Results Owners Report\u003c\/h3\u003e\n\u003cul style=\"font-size: 16.5px; max-width: 680px; margin: 0 auto;\"\u003e\n\u003cli\u003eEven crisper throttle tip-in and stronger mid-range pull\u003c\/li\u003e\n\u003cli\u003eMaximum power consistency on hot days and repeated pulls\u003c\/li\u003e\n\u003cli\u003eExtra headroom for your existing tune, downpipes, and E85\u003c\/li\u003e\n\u003cli\u003eZero check-engine lights • No ECU retune required\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-align: center; font-size: 15px; font-style: italic; margin: 20px 0;\"\u003e\n“Swapped to the Magnum FLOW OE w\/ Pro 5R combo and the car feels a full step quicker. Throttle is razor sharp with the downpipes.”\n– Alex R., 2015 CLS550 • 512 whp\n\u003c\/p\u003e\n\u003ch3 style=\"margin-top: 30px; text-align: center;\"\u003eWhat You Get\u003c\/h3\u003e\n\u003cul style=\"text-align: center; list-style: none; padding: 0; font-size: 17px;\"\u003e\n\u003cli\u003e✔ 2× Precision CNC-machined airbox spacers (left + right)\u003c\/li\u003e\n\u003cli\u003e✔ 2× aFe Magnum FLOW OE Replacement Air Filters w\/ Pro 5R Media\u003c\/li\u003e\n\u003cli\u003e✔ All stainless hardware + install instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin-top: 28px; color: #000; text-align: center;\"\u003eFits These M278 4.7L BiTurbo Models\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; background: #f9f9f9;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #222; color: #fff;\"\u003e\n\u003cth style=\"padding: 12px; text-align: left;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left;\"\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px;\"\u003eE 550 • CLS 550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003eW212 \/ C218\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003e2012–2016\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #fff;\"\u003e\n\u003ctd style=\"padding: 10px;\"\u003eS 550 \/ S 560\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003eW222 • W221\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003e2014–2017 (W222) \/ 2012–2013 (W221)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px;\"\u003eGL \/ GLS 450 • 550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003eX166\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003e2013–2019\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #fff;\"\u003e\n\u003ctd style=\"padding: 10px;\"\u003eML 450 • ML 550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003eW166\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003e2012–2015\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv style=\"text-align: center; margin: 32px 0 20px;\"\u003e\n\u003cp style=\"font-size: 17px;\"\u003e\u003cstrong\u003eInstall in ~20 minutes • No tools beyond a 10mm socket • Fully reversible\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp style=\"text-align: center; margin-top: 25px; font-size: 13px; color: #777;\"\u003eBenzUnited Parts • Mercedes Performance Specialist\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46493194649775,"sku":null,"price":325.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/image_19.jpg?v=1782469407"},{"product_id":"blow-off-valve-kit-for-mercedes-m278-turbo-protection-upgrade","title":"Turbo Pressure Relief Kit for E550 \u0026 CLS550 | M278 V8 Biturbo","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: 1.65;\"\u003e\n\u003cp\u003eProtect your turbochargers and upgrade your forced-induction system with the \u003cstrong\u003eTurbo Pressure Relief Kit\u003c\/strong\u003e, engineered specifically for \u003cstrong\u003eMercedes-AMG M278 twin-turbo V8 engines\u003c\/strong\u003e. This precision-designed kit helps prevent \u003cstrong\u003ecompressor surge\u003c\/strong\u003e, reducing stress on turbochargers and supporting long-term reliability—especially on tuned or aggressively driven vehicles.\u003c\/p\u003e\n\u003cp\u003eUnlike factory recirculation systems that can allow pressure backflow during throttle lift, this system safely releases excess charge air, helping protect turbo internals and maintain consistent boost behavior during rapid shifts and spirited driving.\u003c\/p\u003e\n\u003ch3 style=\"margin-top: 22px;\"\u003eKey Features \u0026amp; Engineering Highlights\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSide-Mount Design:\u003c\/strong\u003e All current kits feature a \u003cstrong\u003eside-mounted pressure relief valve\u003c\/strong\u003e configuration for improved packaging and consistent operation (not center-mounted).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Turbo Protection:\u003c\/strong\u003e Relieves excess boost pressure to reduce compressor surge and minimize turbocharger stress.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM278-Specific Design:\u003c\/strong\u003e Optimized for the airflow characteristics and operating demands of the M278 twin-turbo platform.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin-top: 22px;\"\u003eComplete Kit Includes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eModified charge pipes\u003c\/li\u003e\n\u003cli\u003eCustom silicone 90° elbow\u003c\/li\u003e\n\u003cli\u003e38mm pressure relief (blow-off) valve\u003c\/li\u003e\n\u003cli\u003eMAP sensor tap\u003c\/li\u003e\n\u003cli\u003eVacuum lines and required installation hardware\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin-top: 22px;\"\u003eFactory Integration\u003c\/h3\u003e\n\u003cp\u003eThis kit is designed to retain the \u003cstrong\u003efactory AMG engine cover\u003c\/strong\u003e. Minor modification to the engine cover mounting bracket is required to ensure proper clearance and fitment.\u003c\/p\u003e\n\u003ch3 style=\"margin-top: 22px;\"\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eApproximate \u003cstrong\u003e2-week preparation time\u003c\/strong\u003e prior to shipping\u003c\/li\u003e\n\u003cli\u003eCutting of the engine cover mounting bracket is required\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended for optimal results\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin-top: 22px;\"\u003eVehicle Compatibility – M278 Engines\u003c\/h3\u003e\n\u003cp\u003eCompatible with Mercedes-Benz vehicles equipped with the \u003cstrong\u003eM278 twin-turbo V8 engine\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMercedes-Benz S550 (2011–2017)\u003c\/li\u003e\n\u003cli\u003eMercedes-Benz CL550 (2011–2014)\u003c\/li\u003e\n\u003cli\u003eMercedes-Benz CLS550 (2011–2018)\u003c\/li\u003e\n\u003cli\u003eMercedes-Benz E550 (2012–2014)\u003c\/li\u003e\n\u003cli\u003eMercedes-Benz ML550 (2012–2014)\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin-top: 18px;\"\u003eThis turbo pressure relief kit is a \u003cstrong\u003efunctional performance upgrade\u003c\/strong\u003e designed to support long-term turbocharger reliability and smoother boost transitions on M278-powered vehicles. It is especially beneficial for owners running aftermarket tuning or increased boost pressure.\u003c\/p\u003e\n\u003cp style=\"text-align: center; margin-top: 26px; font-weight: bold;\"\u003eUpgrade with confidence. Protect your turbos. Drive your M278-powered AMG the way it was meant to be driven.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"I'll send in my Original chargepipes after purchase (+ $200)","offer_id":46550103261359,"sku":null,"price":1349.0,"currency_code":"USD","in_stock":true},{"title":"I'll send the Original chargepipes before purchase","offer_id":46550103294127,"sku":null,"price":1149.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/m278-turbo-pressure-relief-kit-charge-pipes-bov.jpg?v=1782475661"},{"product_id":"bilstein-b4-oe-replacement-front-left-air-strut-mercedes-s550-4matic-2014-2017","title":"Bilstein B4 OE Replacement Front Left Air Strut Mercedes S550 2014-2017","description":"\u003cdiv style=\"font-family: Arial, sans-serif; color: #222; line-height: 1.7; max-width: 900px; margin: auto;\"\u003e\n\u003ch2 style=\"text-align: center; color: #b60000; margin-bottom: 20px;\"\u003eBilstein B4 OE Replacement Air Strut Front Left Mercedes S550 2014-2017 (Fits 4Matic models)\u003c\/h2\u003e\n\u003cp style=\"text-align: center; font-size: 1.15em; margin-bottom: 24px;\"\u003eGenuine Bilstein B4 OE Replacement Air Strut. Direct plug-and-play replacement that restores original ride comfort, handling, and smoothness to your Mercedes S550 with factory Airmatic suspension.\u003c\/p\u003e\n\u003cdiv style=\"background: #f9f9f9; border: 2px solid #ddd; padding: 22px; border-radius: 10px; margin: 28px 0;\"\u003e\n\u003ch3 style=\"margin-top: 0; color: #b60000; text-align: center;\"\u003eFitment Table\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 16px 0px; height: 47.6px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: rgb(240, 240, 240); height: 23.8px;\"\u003e\n\u003cth style=\"padding: 10px; border: 1px solid rgb(221, 221, 221); text-align: left; height: 23.8px;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid rgb(221, 221, 221); text-align: left; height: 23.8px;\"\u003eYears\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid rgb(221, 221, 221); text-align: left; height: 23.8px;\"\u003eDrivetrain\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid rgb(221, 221, 221); text-align: center; height: 23.8px;\"\u003ePosition\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 23.8px;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid rgb(221, 221, 221); height: 23.8px;\"\u003eMercedes-Benz S550 (W222)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid rgb(221, 221, 221); height: 23.8px;\"\u003e2014–2017\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid rgb(221, 221, 221); height: 23.8px;\"\u003e4MATIC\/RWD\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid rgb(221, 221, 221); text-align: center; height: 23.8px;\"\u003e\u003cstrong\u003eFront Left\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"margin: 0px; font-size: 0.95em; color: rgb(182, 0, 0); text-align: center;\"\u003e⚠️ This is for the \u003cstrong\u003eFront Left\u003c\/strong\u003e position and fits 4matic models.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"margin: 32px 0 12px; color: #b60000;\"\u003eKey Features\u003c\/h3\u003e\n\u003cul style=\"margin-bottom: 28px; padding-left: 20px;\"\u003e\n\u003cli\u003eDirect OE replacement – plugs into original electrical connectors\u003c\/li\u003e\n\u003cli\u003eNo modifications or coding required\u003c\/li\u003e\n\u003cli\u003eMonotube design for consistent damping performance\u003c\/li\u003e\n\u003cli\u003eMultiple stud upper mount and clevis lower mount\u003c\/li\u003e\n\u003cli\u003eDurable black finish for corrosion resistance\u003c\/li\u003e\n\u003cli\u003eManufactured to meet or exceed original equipment standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin: 32px 0 12px; color: #b60000;\"\u003eSpecifications\u003c\/h3\u003e\n\u003cul style=\"margin-bottom: 28px; padding-left: 20px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Bilstein\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e B4 OE Replacement (Air)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePosition:\u003c\/strong\u003e Front Left\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUpper Mount:\u003c\/strong\u003e Multiple Studs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLower Mount:\u003c\/strong\u003e Clevis\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal Design:\u003c\/strong\u003e Monotube\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBoot Included:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 44-240004\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-align: center; font-size: 1.2em; font-weight: bold; color: #b60000; margin: 40px 0 10px;\"\u003eRestore the smooth, factory-like ride to your S550.\u003c\/p\u003e\n\u003cp style=\"text-align: center; font-size: 1.05em; color: #b60000;\"\u003e⚠️ Professional installation recommended. For vehicles with factory Airmatic suspension only.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46703821095087,"sku":null,"price":1599.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/bilstein-b4-front-left-air-strut-s550-2014-2017.webp?v=1774499230"},{"product_id":"bilstein-b4-oe-replacement-front-right-air-strut-mercedes-s550-4matic-2014-2017","title":"Bilstein B4 OE Replacement Front Right Air Strut Mercedes S550 4MATIC 2014-2017","description":"\u003cdiv style=\"font-family: Arial, sans-serif; color: #222; line-height: 1.7; max-width: 900px; margin: auto;\"\u003e\n\u003ch2 style=\"text-align: center; color: #b60000; margin-bottom: 20px;\"\u003eBilstein B4 OE Replacement Air Strut Front Right Mercedes S550 2014-2017 (Fits 4Matic)\u003c\/h2\u003e\n\u003cp style=\"text-align: center; font-size: 1.15em; margin-bottom: 24px;\"\u003eRestore your factory ride quality with this Bilstein B4 OE Replacement Air Strut. Direct plug-and-play replacement for the Front Right position on your Mercedes-Benz S550 with Airmatic suspension.\u003c\/p\u003e\n\u003cdiv style=\"background: #f9f9f9; border: 2px solid #ddd; padding: 22px; border-radius: 10px; margin: 28px 0;\"\u003e\n\u003ch3 style=\"margin-top: 0; color: #b60000; text-align: center;\"\u003eFitment Table\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 16px 0;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #f0f0f0;\"\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd; text-align: left;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd; text-align: left;\"\u003eYears\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd; text-align: center;\"\u003e4MATIC\u003c\/th\u003e\n\u003cth style=\"padding: 10px; border: 1px solid #ddd; text-align: center;\"\u003ePosition\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;\"\u003eMercedes-Benz S550 (W222)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd;\"\u003e2014–2017\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd; text-align: center;\"\u003eYes\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ddd; text-align: center;\"\u003e\u003cstrong\u003eFront Right\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"margin: 0px; font-size: 0.95em; color: rgb(182, 0, 0); text-align: center;\"\u003e⚠️ This strut is for the \u003cstrong\u003eFront Right\u003c\/strong\u003e position and fits 4MATIC models.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"margin: 32px 0 12px; color: #b60000;\"\u003eKey Features\u003c\/h3\u003e\n\u003cul style=\"margin-bottom: 28px; padding-left: 20px;\"\u003e\n\u003cli\u003eDirect OE replacement – plugs into original electrical connectors\u003c\/li\u003e\n\u003cli\u003eNo modifications or coding required\u003c\/li\u003e\n\u003cli\u003eMonotube design for consistent damping and performance\u003c\/li\u003e\n\u003cli\u003eMultiple stud upper mount and clevis lower mount\u003c\/li\u003e\n\u003cli\u003eDurable black finish for corrosion resistance\u003c\/li\u003e\n\u003cli\u003eManufactured to meet or exceed original equipment standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin: 32px 0 12px; color: #b60000;\"\u003eSpecifications\u003c\/h3\u003e\n\u003cul style=\"margin-bottom: 28px; padding-left: 20px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Bilstein\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e B4 OE Replacement (Air)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePosition:\u003c\/strong\u003e Front Right\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUpper Mount:\u003c\/strong\u003e Multiple Studs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLower Mount:\u003c\/strong\u003e Clevis\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal Design:\u003c\/strong\u003e Monotube\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBoot Included:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 44-240011\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-align: center; font-size: 1.2em; font-weight: bold; color: #b60000; margin: 40px 0 10px;\"\u003eRestore the smooth, luxurious factory ride to your S550.\u003c\/p\u003e\n\u003cp style=\"text-align: center; font-size: 1.05em; color: #b60000;\"\u003e⚠️ Professional installation recommended. For vehicles with factory Airmatic suspension only.\u003cbr\u003eCalifornia Proposition 65 Warning: Cancer \u0026amp; Reproductive Harm - www.P65Warnings.ca.gov\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46703833317551,"sku":null,"price":1599.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/bilstein-b4-front-right-air-strut-s550-2014-2017.webp?v=1774500899"},{"product_id":"bc-racing-ds-type-coilovers-mercedes-cls-class-w218-sedan-2012-2019-digressive-piston","title":"BC Racing DS Type Coilovers Mercedes CLS-Class W218 Sedan 2012-2019 - Digressive Piston","description":"\u003cdiv style=\"font-family: Arial, sans-serif; color: #222; line-height: 1.7; max-width: 900px; margin: auto;\"\u003e\n\n  \u003ch2 style=\"text-align: center; color: #b60000; margin-bottom: 20px;\"\u003eBC Racing DS Type Coilovers Mercedes-Benz CLS-Class W218 Sedan 2012-2019\u003c\/h2\u003e\n\n  \u003cp style=\"text-align: center; font-size: 1.15em; margin-bottom: 24px;\"\u003e\n    Experience sharper handling and superior driver feedback with BC Racing DS Series Coilovers. \n    The DS Type features a proprietary \u003cstrong\u003edigressive piston design\u003c\/strong\u003e that provides firm low-speed damping for excellent body control while allowing smoother, more compliant response at higher speeds — ideal for spirited street driving, canyons, and track days.\n  \u003c\/p\u003e\n\n  \u003cdiv style=\"background: #f9f9f9; border: 2px solid #ddd; padding: 22px; border-radius: 10px; margin: 28px 0; text-align: center;\"\u003e\n    \u003ch3 style=\"margin-top: 0; color: #b60000;\"\u003eFitment\u003c\/h3\u003e\n    \u003cp style=\"font-size: 1.1em; margin: 12px 0;\"\u003e\n      \u003cstrong\u003eMercedes-Benz CLS-Class W218 Sedan\u003c\/strong\u003e\u003cbr\u003e\n      2012 • 2013 • 2014 • 2015 • 2016 • 2017 • 2018 • 2019\n    \u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003ch3 style=\"margin: 32px 0 12px; color: #b60000;\"\u003eWhat Are Digressive Shocks?\u003c\/h3\u003e\n  \u003cp\u003e\n    Unlike traditional linear shocks that apply consistent damping force, digressive shocks deliver \u003cstrong\u003ehigher damping force at low piston speeds\u003c\/strong\u003e (when the car is rolling, pitching, or making small weight transfers) and then taper off at higher speeds. \n    This gives you better chassis control and reduced body movement during cornering and braking, while still soaking up larger bumps comfortably.\n  \u003c\/p\u003e\n\n  \u003ch3 style=\"margin: 32px 0 12px; color: #b60000;\"\u003eSpring Rates \u0026amp; Handling Characteristics\u003c\/h3\u003e\n  \u003cp\u003e\n    This kit comes with \u003cstrong\u003e6kg\/mm front\u003c\/strong\u003e and \u003cstrong\u003e15kg\/mm rear\u003c\/strong\u003e springs as default. \n    The relatively soft front rate helps maintain good ride comfort and steering feel on the street, while the significantly stiffer rear rate reduces squat under acceleration and improves stability during hard cornering. \n    Overall, expect a sportier, more planted feel with reduced body roll compared to stock — without being overly harsh for daily driving.\n  \u003c\/p\u003e\n\n  \u003ch3 style=\"margin: 32px 0 12px; color: #b60000;\"\u003eKey Features\u003c\/h3\u003e\n  \u003cul style=\"margin-bottom: 28px; padding-left: 20px;\"\u003e\n    \u003cli\u003eProprietary digressive piston – superior low-speed control with compliant high-speed response\u003c\/li\u003e\n    \u003cli\u003e30 levels of simultaneous compression \u0026amp; rebound adjustment\u003c\/li\u003e\n    \u003cli\u003eHeight adjustment independent of spring compression (full damper travel retained)\u003c\/li\u003e\n    \u003cli\u003eMono-tube shock design with satin chrome finished body\u003c\/li\u003e\n    \u003cli\u003eFront camber plates included (rear camber plates available separately)\u003c\/li\u003e\n    \u003cli\u003eFully rebuildable design – compatible with custom rates and Swift springs\u003c\/li\u003e\n    \u003cli\u003e1-Year manufacturer warranty\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3 style=\"margin: 32px 0 12px; color: #b60000;\"\u003eDefault Spring Rates\u003c\/h3\u003e\n  \u003cul style=\"margin-bottom: 28px; padding-left: 20px;\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFront:\u003c\/strong\u003e 6 kg\/mm\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRear:\u003c\/strong\u003e 15 kg\/mm\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3 style=\"margin: 32px 0 12px; color: #b60000;\"\u003eImportant Note\u003c\/h3\u003e\n  \u003cp\u003e\n    Optimal ride height and spring rates can vary depending on your specific CLS model (RWD vs 4MATIC), wheel\/tire setup, and intended use. \n    For the best setup recommendation, please contact our sales team before ordering.\n  \u003c\/p\u003e\n\n  \u003cp style=\"text-align: center; font-size: 1.2em; font-weight: bold; color: #b60000; margin: 40px 0 10px;\"\u003e\n    Transform your CLS W218 into a sharper, more responsive driver's car with BC Racing DS Coilovers.\n  \u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46703905177775,"sku":null,"price":1395.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/bc-racing-ds-coilovers-mercedes-cls-w218-2012-2019.webp?v=1774502285"},{"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"},{"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"},{"product_id":"7-piece-carbon-fiber-interior-trim-bundle-c207-a207","title":"7-Piece Carbon Fiber Style Interior Trim Bundle for Mercedes E-Class C207 Coupe \u0026 A207 Cabriolet - Stainless Steel","description":"\u003cdiv style=\"max-width: 800px; margin: 0 auto; font-family: -apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Arial,sans-serif; line-height: 1.7; color: #222;\"\u003e\n\u003cp\u003eThis complete 7-piece stainless steel carbon fiber style trim bundle instantly transforms your Mercedes E-Class interior with a sleek, high-end look. Designed specifically for \u003cstrong\u003eC207 Coupe\u003c\/strong\u003e and \u003cstrong\u003eA207 Cabriolet\u003c\/strong\u003e models (2010–2017 E350, E400, E550).\u003c\/p\u003e\n\u003ch2 style=\"font-size: 20px; margin: 32px 0 12px;\"\u003eWhat's Included (Full 7-Piece Bundle)\u003c\/h2\u003e\n\u003cul style=\"margin: 0 0 24px 20px; padding: 0; list-style: none;\"\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e• \u003cstrong\u003eDoor Panel Trim Set (4 Pieces)\u003c\/strong\u003e — Two long accent strips + two door panel accents that replace the seat adjustment knob surrounds (Left + Right, front \u0026amp; rear)\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e• \u003cstrong\u003eGlove Box Accent Set (2 Pieces)\u003c\/strong\u003e — One long trim strip + one refined accent piece positioned to the left of the radio headunit\u003c\/li\u003e\n\u003cli style=\"margin-bottom: 10px;\"\u003e• \u003cstrong\u003eCenter Console Cup Holder Trim (1 Piece)\u003c\/strong\u003e — One direct replacement panel with dual cup holder cutouts and silver accent rings\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 style=\"font-size: 20px; margin: 32px 0 12px;\"\u003ePremium Stainless Steel Construction\u003c\/h2\u003e\n\u003cp\u003eUnlike cheap ABS plastic kits, every piece is made from high-grade stainless steel with a stunning high-gloss carbon fiber finish. Benefits include superior durability, scratch resistance, heat stability in hot parked cars, and a noticeably more solid, luxurious feel.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 20px; margin: 32px 0 12px;\"\u003eEasy Installation\u003c\/h2\u003e\n\u003cp\u003ePre-applied automotive-grade tape on most pieces + direct-fit cup holder trim. Clean surfaces with isopropyl alcohol, test fit first, and warm the interior slightly in cold weather for best adhesion. No drilling required.\u003c\/p\u003e\n\u003ch2 style=\"font-size: 20px; margin: 32px 0 12px;\"\u003eCompatibility\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 15px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #f8f8f8;\"\u003e\n\u003cth style=\"padding: 12px 10px; text-align: left; border: 1px solid #ddd;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 12px 10px; text-align: left; border: 1px solid #ddd;\"\u003eBody Style\u003c\/th\u003e\n\u003cth style=\"padding: 12px 10px; text-align: left; 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: 12px 10px; border: 1px solid #ddd;\"\u003eE350, E400, E550\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 10px; border: 1px solid #ddd;\"\u003eCoupe (C207)\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 10px; border: 1px solid #ddd;\"\u003e2010–2017\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 12px 10px; border: 1px solid #ddd;\"\u003eE350, E400, E550\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 10px; border: 1px solid #ddd;\"\u003eCabriolet (A207)\u003c\/td\u003e\n\u003ctd style=\"padding: 12px 10px; border: 1px solid #ddd;\"\u003e2010–2017\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Does \u003cstrong\u003enot\u003c\/strong\u003e fit Sedan (W212) or Wagon (S212).\u003c\/p\u003e\n\u003cdiv style=\"margin-top: 40px; text-align: center; font-size: 15px; color: #555;\"\u003e\n\u003cstrong\u003ebenzunited parts • Quality Mercedes \u0026amp; AMG Components\u003c\/strong\u003e\u003cbr\u003eExact items shown • Buyer responsible for fitment verification\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46995347046575,"sku":"BU-INT-TRIMKIT-C207-7PC","price":249.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/mercedes-c207-a207-7-piece-carbon-fiber-interior-trim-bundle-installed.webp?v=1780789123"},{"product_id":"k-n-performance-air-filters-for-mercedes-e550-cls550-s550","title":"K\u0026N Performance Air Filter Set for Mercedes E550 \/ CLS550 \/ S550 (4.7L V8 Bi-Turbo)","description":"\u003cdiv style=\"max-width: 920px; margin: 0 auto; font-family: Arial, Helvetica, sans-serif; line-height: 1.65; color: #222; font-size: 16px; background: #fff;\"\u003e\n\u003cp style=\"text-align: center; font-size: 18px; font-weight: bold; margin: 12px 0 16px;\"\u003eK\u0026amp;N Performance Air Filters – Pair (Mfg Part # 33-2474)\u003c\/p\u003e\n\u003cp style=\"text-align: center; background: #f8f8f8; padding: 14px; border-radius: 8px; font-size: 17px;\"\u003e\u003cstrong\u003eThe legendary red K\u0026amp;N drop-in filters\u003c\/strong\u003e trusted by tuned M278 owners for over a decade — instant throttle sharpness and proven horsepower gains with zero hassle.\u003c\/p\u003e\n\u003chr style=\"border: none; height: 2px; background: linear-gradient(to right, #eee, #d32f2f, #eee); margin: 25px 0;\"\u003e\n\u003ch2 style=\"color: #000; text-align: center; font-size: 26px; margin: 25px 0 15px;\"\u003eWhy K\u0026amp;N Performance Filters Are Perfect for Your M278\u003c\/h2\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 15px; justify-content: center;\"\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; background: #f9f9f9; padding: 16px; border-radius: 8px;\"\u003e\n\u003cstrong\u003e✅ Boosts Horsepower \u0026amp; Acceleration\u003c\/strong\u003e\u003cbr\u003eHigh-flow oiled cotton media delivers measurable gains in throttle response and mid-range power.\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; background: #f9f9f9; padding: 16px; border-radius: 8px;\"\u003e\n\u003cstrong\u003e✅ Washable \u0026amp; Reusable\u003c\/strong\u003e\u003cbr\u003eClean and re-oil every 50,000 miles — backed by K\u0026amp;N’s famous \u003cstrong\u003eMillion Mile Limited Warranty®\u003c\/strong\u003e.\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; background: #f9f9f9; padding: 16px; border-radius: 8px;\"\u003e\n\u003cstrong\u003e✅ 100% OEM Drop-In Fit\u003c\/strong\u003e\u003cbr\u003ePerfect factory seal, works with stock MAF \u0026amp; electronics, CARB legal in all 50 states, will NOT void your warranty.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"margin: 28px 0 12px; color: #d32f2f; text-align: center;\"\u003eReal-World Results Owners Report\u003c\/h3\u003e\n\u003cul style=\"font-size: 16.5px; max-width: 680px; margin: 0 auto;\"\u003e\n\u003cli\u003eNoticeably crisper throttle and stronger mid-range pull\u003c\/li\u003e\n\u003cli\u003eBetter power delivery on hot days and repeated runs\u003c\/li\u003e\n\u003cli\u003ePerfect match for headers, downpipes, tune, E85 or spacers\u003c\/li\u003e\n\u003cli\u003eZero check-engine lights • No tuning required\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-align: center; font-size: 15px; font-style: italic; margin: 20px 0;\"\u003e“Put the K\u0026amp;N pair in my E550 last week — throttle is way sharper and it pulls harder through the gears. Exactly what I expected from K\u0026amp;N.” – Alex R., 2015 CLS550 • 512 whp\u003c\/p\u003e\n\u003ch3 style=\"margin-top: 30px; text-align: center;\"\u003eWhat You Get (Sold as Pair)\u003c\/h3\u003e\n\u003cul style=\"text-align: center; list-style: none; padding: 0; font-size: 17px;\"\u003e\n\u003cli\u003e✔ 2 × K\u0026amp;N High-Flow Performance Air Filters (Left + Right) – Part # 33-2474\u003c\/li\u003e\n\u003cli\u003e✔ Pre-oiled and ready to install\u003c\/li\u003e\n\u003cli\u003e✔ Installation instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin-top: 28px; color: #000; text-align: center;\"\u003eFits These M278 4.7L BiTurbo V8 Models\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; background: #f9f9f9;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #222; color: #fff;\"\u003e\n\u003cth style=\"padding: 12px; text-align: left;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left;\"\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px;\"\u003eE 550 • CLS 550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003eW212 \/ C218\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003e2012–2016\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #fff;\"\u003e\n\u003ctd style=\"padding: 10px;\"\u003eS 550 \/ S 560 • CL 550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003eW221 • W222 • C216 • C217 • A217\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003e2011–2017\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px;\"\u003eSL 550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003eR231\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003e2013–2020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #fff;\"\u003e\n\u003ctd style=\"padding: 10px;\"\u003eGL \/ GLS 450 • 550 • ML \/ GLE 550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003eX166 • W166\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003e2012–2019\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size: 13px; text-align: center; color: #666; margin: 8px 0 0;\"\u003eOE Cross Reference: 2780940004 • 278094000495 • 278094000490 • Always confirm M278 engine code\u003c\/p\u003e\n\u003ch3 style=\"margin: 34px 0 14px; text-align: center;\"\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;\"\u003eWill these void my factory warranty?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eNo. They're a drop-in replacement that works with the stock MAF and electronics, and they're CARB legal in all 50 states.\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;\"\u003eNo tuning required, and no check engine lights. They run on the stock tune as a direct replacement for the factory filters.\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 often do they need cleaning?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eClean and re-oil roughly every 50,000 miles. They're washable and reusable rather than disposable, and carry K\u0026amp;N's Million Mile Limited Warranty.\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;\"\u003eAm I getting one filter or two?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eTwo — this is sold as a pair (left and right), since the M278 uses two filters. They arrive pre-oiled with installation instructions.\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 the install take?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eUnder 5 minutes, no tools required, and fully reversible — they drop straight into the factory airboxes.\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 confirm these fit my car?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eConfirm your car has the M278 4.7L biturbo V8 — the engine code decides fitment, not the badge. Covered chassis are in the table above, and OE cross references are 2780940004 \/ 278094000495 \/ 278094000490. If you're unsure, message us your year, model, and VIN.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdiv style=\"text-align: center; margin: 32px 0 20px;\"\u003e\n\u003cp style=\"font-size: 17px;\"\u003e\u003cstrong\u003eDrop-in install in under 5 minutes • No tools needed • Fully reversible\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp style=\"text-align: center; margin-top: 25px; font-size: 13px; color: #777;\"\u003eBenzUnited Parts • Mercedes Performance Specialist • Ships from USA\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":47117753090223,"sku":null,"price":150.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/kn-33-2474-m278-air-filters-pair-mercedes-e550-cls550-s550.webp?v=1782470995"},{"product_id":"m278-mercedes-intake-spacer-kit-set-of-k-n-drop-in-performance-air-filters-4-7l-v8-bi-turbo","title":"M278 Mercedes Intake Spacer Kit + Set of K\u0026N Drop-in Performance Air Filters (4.7L V8 Bi-Turbo)","description":"\u003cdiv style=\"max-width: 920px; margin: 0 auto; font-family: Arial, Helvetica, sans-serif; line-height: 1.65; color: #222; font-size: 16px; background: #fff;\"\u003e\n\u003cp style=\"text-align: center; background: #f8f8f8; padding: 14px; border-radius: 8px; font-size: 17px;\"\u003e\u003cstrong\u003eThe ultimate OEM+ intake upgrade\u003c\/strong\u003e — K\u0026amp;N high-flow filters + precision airbox spacers for maximum throttle sharpness and mid-range power.\u003c\/p\u003e\n\u003chr style=\"border: none; height: 2px; background: linear-gradient(to right, #eee, #d32f2f, #eee); margin: 25px 0;\"\u003e\n\u003ch2 style=\"color: #000; text-align: center; font-size: 26px; margin: 25px 0 15px;\"\u003eWhy This K\u0026amp;N + Spacer Combo Crushes It on the M278\u003c\/h2\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 15px; justify-content: center;\"\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; background: #f9f9f9; padding: 16px; border-radius: 8px;\"\u003e\n\u003cstrong\u003e✅ Airbox Spacers (Left + Right)\u003c\/strong\u003e\u003cbr\u003eRaises the filter sealing plane for smoother, higher-volume airflow into the MAF housing.\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; background: #f9f9f9; padding: 16px; border-radius: 8px;\"\u003e\n\u003cstrong\u003e✅ K\u0026amp;N 33-2474 Performance Filters\u003c\/strong\u003e\u003cbr\u003eLegendary oiled cotton media + Million Mile Warranty® — proven HP gains, washable, CARB legal, no tuning needed.\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; background: #f9f9f9; padding: 16px; border-radius: 8px;\"\u003e\n\u003cstrong\u003e✅ Factory Airbox Retained\u003c\/strong\u003e\u003cbr\u003eKeeps perfect cold-air routing \u0026amp; heat shields — zero heat-soak, zero MAF issues.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"margin: 28px 0 12px; color: #d32f2f; text-align: center;\"\u003eReal-World Results Owners Report\u003c\/h3\u003e\n\u003cul style=\"font-size: 16.5px; max-width: 680px; margin: 0 auto;\"\u003e\n\u003cli\u003eCrispier throttle tip-in and noticeably stronger mid-range pull\u003c\/li\u003e\n\u003cli\u003eBetter power consistency on hot days and repeated pulls\u003c\/li\u003e\n\u003cli\u003ePerfect headroom for headers, downpipes, tune, or E85\u003c\/li\u003e\n\u003cli\u003eZero check-engine lights • Fully reversible • No ECU retune\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-align: center; font-size: 15px; font-style: italic; margin: 20px 0;\"\u003e“K\u0026amp;N filters + spacers on my E550 with downpipes = night and day difference. Throttle is razor sharp and it pulls way harder now.” – Alex R., 2015 CLS550 • 512 whp\u003c\/p\u003e\n\u003ch3 style=\"margin-top: 30px; text-align: center;\"\u003eWhat You Get (Full Combo Kit)\u003c\/h3\u003e\n\u003cul style=\"text-align: center; list-style: none; padding: 0; font-size: 17px;\"\u003e\n\u003cli\u003e✔ 2 × Precision CNC-machined airbox spacers (left + right)\u003c\/li\u003e\n\u003cli\u003e✔ 2 × K\u0026amp;N 33-2474 High-Flow Performance Air Filters (pre-oiled)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin-top: 28px; color: #000; text-align: center;\"\u003eFits These M278 4.7L BiTurbo V8 Models\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 15px; background: #f9f9f9;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background: #222; color: #fff;\"\u003e\n\u003cth style=\"padding: 12px; text-align: left;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left;\"\u003eChassis\u003c\/th\u003e\n\u003cth style=\"padding: 12px; text-align: left;\"\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px;\"\u003eE 550 • CLS 550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003eW212 \/ C218\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003e2012–2016\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #fff;\"\u003e\n\u003ctd style=\"padding: 10px;\"\u003eS 550 \/ S 560 • CL 550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003eW221 • W222 • C216 • C217 • A217\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003e2011–2017\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px;\"\u003eSL 550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003eR231\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003e2013–2020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #fff;\"\u003e\n\u003ctd style=\"padding: 10px;\"\u003eGL \/ GLS 450 • 550 • ML \/ GLE 550\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003eX166 • W166\u003c\/td\u003e\n\u003ctd style=\"padding: 10px;\"\u003e2012–2019\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size: 13px; text-align: center; color: #666; margin: 8px 0 0;\"\u003e✅ Always verify M278 engine code • Message me if unsure\u003c\/p\u003e\n\u003ch3 style=\"margin: 34px 0 14px; text-align: center;\"\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 I need a tune after installing this?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eNo. This kit runs on the stock tune with no ECU changes, no check engine lights, and no MAF issues — the factory airbox and cold-air routing are retained.\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 do the spacers actually do?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eThey raise the filter sealing plane, which lets more air move into the MAF housing than the factory arrangement allows. You keep the OEM airbox and heat shielding, so there's no heat soak — unlike an open-element intake.\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 the install take?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eAbout 20 minutes with a 10mm socket. No other tools needed, and it's fully reversible if you ever want to go back to stock.\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 filters need cleaning?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eYes — the K\u0026amp;N 33-2474 filters are washable oiled cotton, so they're cleaned and re-oiled rather than replaced. They carry K\u0026amp;N's Million Mile Warranty.\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 this worth it if my car is already modified?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eThat's where it does the most. On cars with downpipes, headers, a tune, or E85, the extra intake headroom matters more. It's a supporting mod, not a standalone power adder.\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 confirm it fits my car?\u003c\/summary\u003e\n\u003cp style=\"margin: 12px 0 0 24px; color: #444;\"\u003eConfirm your car has the M278 4.7L biturbo V8 — the engine code decides fitment, not the badge. Covered chassis are listed in the table above. If you're unsure, message us your year, model, and VIN and we'll confirm before you order.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdiv style=\"text-align: center; margin: 32px 0 20px;\"\u003e\n\u003cp style=\"font-size: 17px;\"\u003e\u003cstrong\u003eInstall in ~20 minutes • No tools beyond a 10mm socket • Fully reversible\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp style=\"text-align: center; margin-top: 25px; font-size: 13px; color: #777;\"\u003eBenzUnited Parts • Mercedes Performance Specialist • Ships from USA\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":47117775863983,"sku":null,"price":285.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/m278-k_n-33-2474-filters-airbox-spacers-studio-product-shot.jpg?v=1782474993"},{"product_id":"carbon-fiber-style-interior-trim-bundle-mercedes-e-class-coupe-cabriolet-c207-a207","title":"Carbon Fiber Style Interior 4 Piece Trim Bundle – Mercedes E-Class Coupe \u0026 Cabriolet (C207 \/ A207)","description":"\u003cdiv style=\"font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; max-width: 100%; line-height: 1.7; color: #1f2937;\"\u003e\n\u003cscript src=\"https:\/\/cdn.tailwindcss.com\"\u003e\u003c\/script\u003e\n\u003cdiv class=\"tailwind-content\"\u003e\n\u003cp class=\"text-lg text-center mt-3 font-medium\"\u003eStop staring at boring factory plastic. Instantly transform your entire cabin with a sharp, glossy carbon fiber motorsport look — at a fraction of real carbon fiber cost. Perfect OEM+ fitment that makes your E-Class look and feel like a true AMG beast.\u003c\/p\u003e\n\u003cdiv class=\"bg-zinc-900 text-white p-6 rounded-xl my-6\"\u003e\n\u003cdiv class=\"grid grid-cols-2 md:grid-cols-4 gap-4 text-center text-sm font-medium\"\u003e\n\u003cdiv\u003e✅ Premium Gloss Carbon Fiber Look\u003c\/div\u003e\n\u003cdiv\u003e✅ Peel \u0026amp; Stick (5 mins, no tools)\u003c\/div\u003e\n\u003cdiv\u003e✅ UV Protected • Won't Fade\u003c\/div\u003e\n\u003cdiv\u003e✅ Perfect Fit + Sporty Edge\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2 class=\"text-2xl font-bold text-zinc-800 mt-8 mb-4\"\u003e✨ Why This Bundle Crushes It\u003c\/h2\u003e\n\u003cul class=\"space-y-3 text-lg\"\u003e\n\u003cli\u003e✅ Realistic high-gloss carbon fiber weave on super-durable ABS plastic\u003c\/li\u003e\n\u003cli\u003e✅ Industrial-strength 3M-style peel-and-stick adhesive — no drilling, no mess\u003c\/li\u003e\n\u003cli\u003e✅ UV-coated for years of showroom shine even in California sun\u003c\/li\u003e\n\u003cli\u003e✅ Clean factory fitment with aggressive motorsport styling\u003c\/li\u003e\n\u003cli\u003e✅ Insane value — complete 3-piece kit (most sellers charge this for just 1 piece)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 class=\"text-2xl font-bold text-zinc-800 mt-8 mb-4\"\u003e📦 What's Included\u003c\/h2\u003e\n\u003cul class=\"grid grid-cols-1 md:grid-cols-2 gap-3 text-lg\"\u003e\n\u003cli\u003e🔹 2× Inner Door Panel Trim Covers (Left + Right)\u003c\/li\u003e\n\u003cli\u003e🔹 1× Glove Box Trim Cover\u003c\/li\u003e\n\u003cli\u003e🔹 1× Center Console Cup Holder Trim Cover\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 class=\"text-2xl font-bold text-zinc-800 mt-8 mb-4\"\u003e🔧 Exact Compatibility\u003c\/h2\u003e\n\u003ctable class=\"w-full border-collapse border border-zinc-300 text-left\"\u003e\n\u003cthead\u003e\n\u003ctr class=\"bg-zinc-100\"\u003e\n\u003cth class=\"border border-zinc-300 px-4 py-2\"\u003eModel\u003c\/th\u003e\n\u003cth class=\"border border-zinc-300 px-4 py-2\"\u003ePlatform\u003c\/th\u003e\n\u003cth class=\"border border-zinc-300 px-4 py-2\"\u003eYears\u003c\/th\u003e\n\u003cth class=\"border border-zinc-300 px-4 py-2\"\u003eEngine\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003eE350 Coupe \/ Cabriolet\u003c\/td\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003eC207 \/ A207\u003c\/td\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003e2010–2013\u003c\/td\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003e3.5L V6 (M272)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003eE350 Coupe \/ Cabriolet\u003c\/td\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003eC207 \/ A207\u003c\/td\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003e2014–2017\u003c\/td\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003e3.5L V6 (M276)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003eE400 Coupe \/ Cabriolet\u003c\/td\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003eC207 \/ A207\u003c\/td\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003e2014–2017\u003c\/td\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003e3.0L V6 TT (M276)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003eE550 Coupe \/ Cabriolet\u003c\/td\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003eC207 \/ A207\u003c\/td\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003e2010–2017\u003c\/td\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003e5.5L V8 (M273)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003eE550 Coupe \/ Cabriolet\u003c\/td\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003eC207 \/ A207\u003c\/td\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003e2013–2017\u003c\/td\u003e\n\u003ctd class=\"border border-zinc-300 px-4 py-2\"\u003e5.5L V8 Biturbo (M278)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv style=\"text-align: center;\" class=\"bg-emerald-100 border border-emerald-300 p-5 rounded-xl text-center my-6 font-semibold text-lg\"\u003e⚡ Fast Shipping from US • 🔄 30-Day Returns • Lifetime Support\u003c\/div\u003e\n\u003cbutton style=\"background: linear-gradient(to right, #18181b, #27272a); color: white; font-weight: bold; padding: 18px 40px; font-size: 20px; border-radius: 9999px; width: 100%; margin: 20px auto; display: block; border: none; cursor: pointer;\"\u003e UPGRADE Your E-Class Now!\u003c\/button\u003e\n\u003cp style=\"text-align: center;\" class=\"text-center text-sm text-zinc-500\"\u003eLimited stock • Ships same day • Thousands already upgraded\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":47122747621551,"sku":"BU-INT-TRIMKIT-C207-4PC","price":139.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/mercedes-e-class-c207-a207-carbon-fiber-interior-trim-kit-installed-4-piece.png?v=1782759461"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/collections\/m278-mercedes-v8-biturbo-engine-bay-e550-cls550-s550.png?v=1763425803","url":"https:\/\/benzunitedparts.com\/collections\/m278-performance-parts-for-mercedes-e550-cls550-s550-sl550-cl550.oembed?page=2","provider":"BenzUnited Parts","version":"1.0","type":"link"}