{"title":"M278 4.7L V8 BiTurbo — E550 \/ CLS550 \/ S550","description":"\u003cp\u003ePerformance parts for the Mercedes M278 4.7L V8 BiTurbo — E550, CLS550, S550, CL550, ML550, GL550. ECU tuning and bolt-ons.\u003c\/p\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":null,"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":"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":null,"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\u003c!-- HERO \/ HOOK --\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\u003c!-- WHY THIS KIT WORKS --\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\u003c!-- WHAT'S INCLUDED --\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\u003c!-- FITMENT --\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\u003c!-- INSTALL + CTA --\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\u003ca href=\"#\" style=\"background: #d32f2f; color: #fff; padding: 16px 40px; font-size: 19px; font-weight: bold; text-decoration: none; border-radius: 6px; display: inline-block; margin: 12px 8px; box-shadow: 0 3px 8px rgba(211,47,47,0.3);\"\u003e 🔥 Add Pulley Set to Cart – Ships Same Day \u003c\/a\u003e\n\u003c\/div\u003e\n\u003c!-- CLOSING --\u003e\n\u003cp style=\"text-align: center; margin-top: 25px; font-size: 13px; color: #777;\"\u003eBenzUnited Parts • Mercedes Performance Specialist • Burbank, CA\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BenzUnited Parts","offers":[{"title":"Default Title","offer_id":46294269001903,"sku":null,"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":null,"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\n  \u003c!-- HERO \/ HOOK --\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  \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\n  \u003chr style=\"border: none; height: 2px; background: linear-gradient(to right, #eee, #d32f2f, #eee); margin: 25px 0;\"\u003e\n\n  \u003c!-- WHY THIS KIT WORKS --\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  \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\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\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\n  \u003c!-- WHAT'S INCLUDED --\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\n  \u003c!-- FITMENT --\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\n  \u003c!-- INSTALL + CTA --\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    \n    \u003ca style=\"background: #d32f2f; color: #fff; padding: 16px 40px; font-size: 19px; font-weight: bold; text-decoration: none; border-radius: 6px; display: inline-block; margin: 12px 8px; box-shadow: 0 3px 8px rgba(211,47,47,0.3);\" href=\"#\"\u003e\n      🔥 Add to Cart – Ships Same Day\n    \u003c\/a\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- CLOSING --\u003e\n  \u003cp style=\"text-align: center; margin-top: 25px; font-size: 13px; color: #777;\"\u003eBenzUnited Parts • Mercedes Performance Specialist\u003c\/p\u003e\n\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\/amg-m157-m278-turbo-pressure-relief-kit-installed-engine-bay.jpg?v=1770660978"},{"product_id":"afe-magnum-flow-air-filters-for-m278-e550-cls550-performance","title":"aFe Magnum FLOW Air Filters for M278 | E550 \/ CLS550 Performance","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\u003c!-- HERO \/ HOOK --\u003e\n\u003cp style=\"text-align: center; font-size: 18px; font-weight: bold; margin: 12px 0 16px;\"\u003eaFe Magnum FLOW OE Replacement Air Filters – Pair (Pro 5R Media)\u003c\/p\u003e\n\u003cp style=\"text-align: center; background: #f8f8f8; padding: 14px; border-radius: 8px; font-size: 17px;\"\u003e\u003cstrong\u003eDrop-in high-flow upgrade\u003c\/strong\u003e that gives your M278 noticeably sharper throttle and more mid-range pull — no tuning, no spacers, no hassle.\u003c\/p\u003e\n\u003chr style=\"border: none; height: 2px; background: linear-gradient(to right, #eee, #d32f2f, #eee); margin: 25px 0;\"\u003e\n\u003c!-- WHY THESE FILTERS --\u003e\n\u003ch2 style=\"color: #000; text-align: center; font-size: 26px; margin: 25px 0 15px;\"\u003eWhy aFe Magnum FLOW Pro 5R Filters Crush 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✅ Massive Flow Increase\u003c\/strong\u003e\u003cbr\u003ePro 5R oiled cotton gauze flows significantly more than stock paper — the most aggressive aFe drop-in available.\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; background: #f9f9f9; padding: 16px; border-radius: 8px;\"\u003e\n\u003cstrong\u003e✅ Pro 5R Oiled Media\u003c\/strong\u003e\u003cbr\u003eMulti-layer oiled cotton traps dirt better while flowing freer. Washable \u0026amp; reusable for the life of the car.\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; min-width: 260px; background: #f9f9f9; padding: 16px; border-radius: 8px;\"\u003e\n\u003cstrong\u003e✅ Perfect OEM Drop-In Fit\u003c\/strong\u003e\u003cbr\u003eExact factory dimensions + urethane seal = zero leaks, zero MAF codes, 100% stock airbox.\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 response right off idle\u003c\/li\u003e\n\u003cli\u003eStronger and smoother mid-range pull\u003c\/li\u003e\n\u003cli\u003eBetter power consistency on hot days and back-to-back runs\u003c\/li\u003e\n\u003cli\u003ePerfect complement to headers, downpipes, tune, or E85\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"text-align: center; font-size: 15px; font-style: italic; margin: 20px 0;\"\u003e“Just the filters alone made my E550 feel way more alive. Throttle is sharper and it pulls harder in the 3–5k range. Super clean install.” – Alex R., 2015 CLS550 • 512 whp\u003c\/p\u003e\n\u003c!-- WHAT'S INCLUDED --\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 × aFe Magnum FLOW OE Replacement Air Filters w\/ Pro 5R Media (Left + Right)\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\u003c!-- FITMENT --\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 confirm M278 engine code • Message me if unsure\u003c\/p\u003e\n\u003c!-- INSTALL + CTA --\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\u003ca href=\"#\" style=\"background: #d32f2f; color: #fff; padding: 16px 40px; font-size: 19px; font-weight: bold; text-decoration: none; border-radius: 6px; display: inline-block; margin: 12px 8px; box-shadow: 0 3px 8px rgba(211,47,47,0.3);\"\u003e 🔥 Add Pair to Cart – Ships Same Day \u003c\/a\u003e\n\u003c\/div\u003e\n\u003c!-- CLOSING --\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":46620087976111,"sku":null,"price":182.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/8718\/9935\/files\/30-10223b1600_f94d15e8-37d3-4c9e-8663-e08d05cd0023.webp?v=1782470907"},{"product_id":"catless-downpipes-for-w222-mercedes-s550-m278-4-7l-v8-biturbo-2011-2017","title":"Catless Downpipes for Mercedes W222 C217 S550 - M278 4.7L V8 BiTurbo (2011–2017)","description":"\u003cdiv style=\"max-width: 1000px; margin: 0 auto; padding: 22px; font-family: ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif; color: #111; line-height: 1.6;\"\u003e\n\u003c!-- Fitment Badge --\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 10px; align-items: center; justify-content: space-between; padding: 14px 16px; border: 1px solid #eaeaea; border-radius: 14px; background: #fafafa; margin-bottom: 16px;\"\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 • 2011–2017\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- Title --\u003e\n\u003ch2 style=\"margin: 0 0 8px 0; font-size: 22px; letter-spacing: -0.3px;\"\u003e2011–2017 Mercedes-Benz S550 M278 Catless Downpipes\u003cbr\u003e\u003cspan style=\"font-size: 15px; color: #555; font-weight: 500;\"\u003eHigh-flow stainless downpipe set for M278 applications\u003c\/span\u003e\n\u003c\/h2\u003e\n\n\u003cp style=\"margin: 0 0 14px 0; color: #333;\"\u003eReduce exhaust restriction and improve turbo response with a \u003cstrong\u003ecatless downpipe set\u003c\/strong\u003e built for the \u003cstrong\u003e2011–2017 Mercedes-Benz S550 (M278 Bi-turbo V8, W222 sedan \u0026amp; C217 coupe chassis)\u003c\/strong\u003e. Designed to increase exhaust flow for faster spool and stronger mid-range response—especially when paired with proper ECU calibration. Owners commonly report noticeably quicker turbo spool-up and improved throttle response after installation.\u003c\/p\u003e\n\n\u003c!-- Trust \/ What You Get --\u003e\n\u003cdiv style=\"padding: 14px 16px; border: 1px solid #eaeaea; border-radius: 14px; background: #fff; box-shadow: 0 1px 0 rgba(0,0,0,0.02); margin-bottom: 18px;\"\u003e\n\u003cdiv style=\"font-weight: 800; margin-bottom: 6px;\"\u003eWhat’s Included\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444;\"\u003eComplete left\/right downpipe set (as pictured). Hardware\/gaskets are not included unless shown in photos.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- Quick Specs --\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 10px; margin-bottom: 18px;\"\u003e\n\u003cdiv style=\"border: 1px solid #eaeaea; border-radius: 14px; padding: 12px 14px; background: #fff;\"\u003e\n\u003cdiv style=\"font-size: 12px; color: #666; margin-bottom: 4px;\"\u003eEngine\u003c\/div\u003e\n\u003cdiv style=\"font-weight: 800;\"\u003eM278 Bi-Turbo V8\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #eaeaea; border-radius: 14px; padding: 12px 14px; background: #fff;\"\u003e\n\u003cdiv style=\"font-size: 12px; color: #666; margin-bottom: 4px;\"\u003eChassis\u003c\/div\u003e\n\u003cdiv style=\"font-weight: 800;\"\u003eS-Class (W222 sedan \u0026amp; C217 coupe)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"border: 1px solid #eaeaea; border-radius: 14px; padding: 12px 14px; background: #fff;\"\u003e\n\u003cdiv style=\"font-size: 12px; color: #666; margin-bottom: 4px;\"\u003eType\u003c\/div\u003e\n\u003cdiv style=\"font-weight: 800;\"\u003eCatless \/ High-Flow\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- Benefits --\u003e\n\u003ch3 style=\"margin: 18px 0 8px 0; font-size: 16px;\"\u003eWhy Upgrade the Factory Downpipes?\u003c\/h3\u003e\n\u003cul style=\"margin: 0 0 14px 18px; padding: 0; color: #333;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved exhaust flow:\u003c\/strong\u003e helps reduce 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 increases exhaust volume and tone (varies by setup).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- ECU Tune CTA --\u003e\n\u003cdiv style=\"background: #fff; border: 1px solid #eaeaea; border-radius: 14px; padding: 16px; margin: 16px 0; text-align: center;\"\u003e\n\u003cdiv style=\"font-weight: 900; font-size: 16px; margin: 0 0 6px; color: #111;\"\u003eRecommended Next Step: ECU Tuning\u003c\/div\u003e\n\u003cdiv style=\"font-size: 13px; color: #555; margin: 0 0 12px;\"\u003eA catless setup may trigger a check engine light without proper ECU calibration or sensor management.\u003c\/div\u003e\n\u003ca href=\"https:\/\/benzunitedparts.com\/products\/custom-ecu-tuning-for-e63-cls63\" style=\"display: inline-block; background: #111; color: #fff; padding: 12px 24px; border-radius: 8px; text-decoration: none; font-weight: 700; font-size: 15px; border: none; box-shadow: 0 2px 4px rgba(0,0,0,0.1); transition: all 0.2s ease;\"\u003eView ECU Tune Options\u003c\/a\u003e\n\u003cdiv style=\"font-size: 12px; color: #777; margin-top: 10px;\"\u003eIf you have a different platform\/tune listing for M278, link this button to that product instead.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- Fitment --\u003e\n\u003ch3 style=\"margin: 16px 0 10px 0; font-size: 16px;\"\u003eFitment\u003c\/h3\u003e\n\u003cdiv style=\"border: 1px solid #eaeaea; border-radius: 14px; background: #fff; padding: 12px 14px;\"\u003e\n\u003cul style=\"margin: 0; padding-left: 18px; line-height: 1.7; color: #333;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eMercedes-Benz S550\u003c\/strong\u003e – \u003cstrong\u003e2011–2017\u003c\/strong\u003e (W222 sedan \u0026amp; C217 coupe chassis)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine:\u003c\/strong\u003e M278 twin-turbo V8\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"font-size: 13px; color: #555; margin-top: 10px; margin-bottom: 18px;\"\u003e\n\u003cstrong\u003eFitment tip:\u003c\/strong\u003e Please confirm your chassis code (W222 or C217) and engine (M278) before ordering. If you’re unsure, message us your VIN (optional) and we’ll help verify compatibility.\u003c\/div\u003e\n\n\u003c!-- Important Notice --\u003e\n\u003cdiv style=\"background: #ffeded; border: 1px solid #f5c2c7; border-radius: 14px; padding: 16px; margin: 18px 0;\"\u003e\n\u003ch3 style=\"margin: 0 0 6px; color: #cc0000; font-size: 18px;\"\u003eImportant Use Notice\u003c\/h3\u003e\n\u003cp style=\"margin: 0; color: #7a1c1c;\"\u003eThis product is intended for off-road or competition use only. Installation may not comply with local emissions regulations and may result in a check engine light without proper tuning.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c!-- Install \/ Notes --\u003e\n\u003cdiv style=\"background: #fff; border: 1px solid #eaeaea; border-radius: 14px; padding: 16px; margin: 16px 0;\"\u003e\n\u003ch3 style=\"margin: 0 0 8px; font-size: 16px; font-weight: 900;\"\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul style=\"margin: 0; padding-left: 18px; line-height: 1.7; color: #333;\"\u003e\n\u003cli\u003eProfessional installation recommended.\u003c\/li\u003e\n\u003cli\u003eInspect\/replace gaskets and hardware as needed during installation.\u003c\/li\u003e\n\u003cli\u003eRe-check for leaks after initial heat cycles.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003c!-- Shipping \/ Returns --\u003e\n\u003cdiv style=\"margin-top: 18px; padding: 14px 16px; border: 1px solid #eaeaea; border-radius: 14px; background: #fafafa;\"\u003e\n\u003cdiv style=\"font-weight: 800; margin-bottom: 6px;\"\u003eShipping \u0026amp; Returns\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444;\"\u003eFast shipping. \u003cstrong\u003e30-day returns\u003c\/strong\u003e accepted for unused and uninstalled items in original packaging. Installed\/modified exhaust components are not eligible for return.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- Support --\u003e\n\u003cdiv style=\"margin-top: 18px; padding: 14px 16px; border: 1px solid #eaeaea; border-radius: 14px; background: #fff;\"\u003e\n\u003cdiv style=\"font-weight: 800; margin-bottom: 6px;\"\u003eNeed help confirming fitment?\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14px; color: #444; margin-bottom: 10px;\"\u003eMessage us your VIN (optional) or confirm your year\/model and engine (M278) and we’ll help verify before you order.\u003c\/div\u003e\n\u003ca href=\"mailto:benzunitedparts@gmail.com?subject=2011-2017%20S550%20M278%20Downpipes%20Fitment%20Help\" style=\"display: inline-block; background: #111; color: #fff; padding: 12px 24px; border-radius: 8px; text-decoration: none; font-weight: 700; font-size: 15px; border: none; box-shadow: 0 2px 4px rgba(0,0,0,0.1); transition: all 0.2s ease;\"\u003eContact Us\u003c\/a\u003e\n\u003c\/div\u003e\n\n\u003c!-- FAQ Section - SEO \u0026 ChatGPT Optimized --\u003e\n\u003cdiv style=\"margin-top: 32px; padding: 20px; border: 1px solid #eaeaea; border-radius: 14px; background: #fff;\"\u003e\n\u003ch3 style=\"margin: 0 0 16px 0; font-size: 18px; font-weight: 800;\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003cdiv style=\"margin-bottom: 18px;\"\u003e\n\u003cstrong\u003eWill these catless downpipes fit my 2011-2017 Mercedes S550 on W222 or C217 chassis?\u003c\/strong\u003e\n\u003cp style=\"margin: 6px 0 0 0; color: #444;\"\u003eYes — these M278 catless downpipes are a direct fit for all 2011–2017 S550 models (W222 sedan \u0026amp; C217 coupe chassis) with the M278 bi-turbo 4.7L V8.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-bottom: 18px;\"\u003e\n\u003cstrong\u003eDo I need a tune with S550 M278 catless downpipes?\u003c\/strong\u003e\n\u003cp style=\"margin: 6px 0 0 0; color: #444;\"\u003eHighly recommended. A catless setup will usually trigger a check engine light without proper ECU tuning or O2 sensor spacers.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-bottom: 18px;\"\u003e\n\u003cstrong\u003eWhat performance gains can I expect from 2011-2017 S550 downpipes?\u003c\/strong\u003e\n\u003cp style=\"margin: 6px 0 0 0; color: #444;\"\u003eNoticeable improvement in turbo spool, throttle response, and mid-range torque when paired with tuning. Many owners report stronger acceleration and a more responsive feel.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-bottom: 18px;\"\u003e\n\u003cstrong\u003eAre these high-flow downpipes loud?\u003c\/strong\u003e\n\u003cp style=\"margin: 6px 0 0 0; color: #444;\"\u003eThey produce a deeper, more aggressive exhaust note than stock catalytic converters. Sound level depends on your full exhaust setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-bottom: 18px;\"\u003e\n\u003cstrong\u003eWill these work on W222 S550 sedan and C217 S550 Coupe?\u003c\/strong\u003e\n\u003cp style=\"margin: 6px 0 0 0; color: #444;\"\u003eYes. The downpipe set is designed for both the W222 sedan and C217 coupe chassis with the M278 engine.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\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\/w222-s63-amg-m157-catless-downpipes-stainless.jpg?v=1772305144"},{"product_id":"2013-2016-mercedes-e550-w212-cls550-c218-m278-rwd-catless-downpipes","title":"M278 Catless Downpipes for Mercedes E550 \/ CLS550 (W212 \/ C218) 2011–2017","description":"\u003cdiv style=\"max-width: 860px; margin: 0 auto; font-family: -apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Arial,sans-serif; line-height: 1.7; color: #222;\"\u003e\n\u003cp style=\"font-size: 16.5px; margin-bottom: 28px;\"\u003eUpgrade your Mercedes M278 BiTurbo V8 with these high-flow \u003cstrong\u003ecatless downpipes\u003c\/strong\u003e. Designed for the 2011–2017 E550 (W212) and CLS550 (C218), they significantly reduce exhaust restriction for faster turbo spool, improved throttle response, and a deeper, more aggressive exhaust note.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 19px; margin: 32px 0 12px;\"\u003eKey Benefits\u003c\/h3\u003e\n\u003cul style=\"line-height: 1.7; padding-left: 20px; margin-bottom: 28px;\"\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 factory catalytic converters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefined AMG exhaust sound\u003c\/strong\u003e — Deeper, more aggressive tone under load with minimal drone during cruising.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved turbo spool \u0026amp; throttle feel\u003c\/strong\u003e — Noticeable gains in responsiveness when paired with proper ECU tuning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"font-size: 19px; margin: 32px 0 12px;\"\u003eVehicle Compatibility\u003c\/h3\u003e\n\u003cdiv style=\"background: #fafafa; border: 1px solid #eaeaea; border-radius: 12px; padding: 18px 20px; margin-bottom: 24px;\"\u003e\n\u003cstrong\u003eE550 (W212) \u0026amp; CLS550 (C218)\u003c\/strong\u003e\u003cbr\u003e2011–2017 • M278 BiTurbo 4.7L V8\u003c\/div\u003e\n\u003ch3 style=\"font-size: 19px; margin: 32px 0 12px;\"\u003eWhat’s Included\u003c\/h3\u003e\n\u003cp style=\"margin-bottom: 24px; font-size: 15.5px;\"\u003eComplete left + right downpipe set (as pictured). Hardware and gaskets not included unless shown.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 19px; margin: 32px 0 12px;\"\u003eInstallation Notes\u003c\/h3\u003e\n\u003cp style=\"margin-bottom: 24px; font-size: 15.5px;\"\u003eDirect bolt-on replacement. Average install time: 1.5–2.5 hours. Professional installation recommended. Re-check for leaks after initial heat cycles.\u003c\/p\u003e\n\u003ch3 style=\"font-size: 19px; margin: 32px 0 12px;\"\u003eRecommended: ECU Tuning\u003c\/h3\u003e\n\u003cp style=\"margin-bottom: 14px; font-size: 15.5px;\"\u003eA catless setup often triggers a check engine light. We highly recommend pairing these downpipes with custom ECU tuning for optimal performance and to clear codes.\u003c\/p\u003e\n\u003cp\u003e\u003ca style=\"display: inline-block; background: #111; color: #fff; padding: 14px 32px; text-decoration: none; border-radius: 8px; font-weight: 600;\" href=\"https:\/\/benzunitedparts.com\/products\/custom-ecu-tuning-for-m278-4-7l-v8-biturbo-e550-cls550-s550-cl550-ml550\"\u003eShop M278 ECU Tuning Options →\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3 style=\"font-size: 19px; margin: 32px 0 12px;\"\u003eImportant Use Notice\u003c\/h3\u003e\n\u003cdiv style=\"background: #fff0f0; border: 1px solid #f5c2c7; border-radius: 12px; padding: 18px; margin-bottom: 24px;\"\u003e\n\u003cp style=\"margin: 0; color: #c33;\"\u003eThis product is intended for off-road, track, or competition use only. It may not comply with local emissions regulations and can trigger a check engine light without proper tuning.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"font-size: 19px; margin: 32px 0 12px;\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul style=\"line-height: 1.7; padding-left: 20px; margin-bottom: 24px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eWill these fit my 2011–2017 E550 or CLS550?\u003c\/strong\u003e Yes — direct fit for W212 E550 and C218 CLS550 with the M278 BiTurbo V8.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDo I need a tune?\u003c\/strong\u003e Highly recommended. Most owners add ECU tuning to avoid check engine lights and maximize performance gains.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat performance gains can I expect?\u003c\/strong\u003e Faster turbo spool, sharper throttle response, and stronger mid-range torque when paired with tuning.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWill they work with aftermarket exhausts?\u003c\/strong\u003e Yes — designed to work with both factory and aftermarket mid-pipes.\u003c\/li\u003e\n\u003c\/ul\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 item shown • Proudly tested on multiple M278 vehicles • Buyer responsible for final fitment verification\u003c\/div\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\/m157-downpipes-mercedes-cls63-w218-closeup.jpg?v=1774837128"},{"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\u003c!-- HERO \/ HOOK --\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\u003c!-- WHY THIS KIT WORKS --\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\u003c!-- WHAT'S INCLUDED --\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)\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- FITMENT --\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\u003c!-- INSTALL + CTA --\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\u003ca href=\"#\" style=\"background: #d32f2f; color: #fff; padding: 16px 40px; font-size: 19px; font-weight: bold; text-decoration: none; border-radius: 6px; display: inline-block; margin: 12px 8px; box-shadow: 0 3px 8px rgba(211,47,47,0.3);\"\u003e 🔥 Add Combo Kit to Cart – Ships Same Day \u003c\/a\u003e\n\u003c\/div\u003e\n\u003c!-- CLOSING --\u003e\n\u003cp style=\"text-align: center; margin-top: 25px; font-size: 13px; color: #777;\"\u003eBenzUnited Parts • Mercedes Performance Specialist • Burbank, CA\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"}],"url":"https:\/\/benzunitedparts.com\/collections\/m278-4-7l-v8-biturbo-e550-cls550-s550.oembed","provider":"BenzUnited Parts","version":"1.0","type":"link"}