{"product_id":"custom-ecu-tuning-for-m278-4-7l-v8-biturbo-e550-cls550-s550","title":"Custom ECU Tuning for M278 4.7L V8 BiTurbo E550 CLS550 S550","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 OEM safeguards intact.\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 \/ +210 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 \/ +210 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!-- Emissions Notice --\u003e\n\u003cdiv style=\"border: 1px solid #e3b7b7; border-left: 5px solid #b02a37; border-radius: 10px; background: #fdf5f5; padding: 14px 16px; margin: 0 0 22px; font-size: 14px; line-height: 1.65; color: #4a2020;\"\u003e\n\u003cstrong style=\"display: block; font-size: 15px; color: #b02a37; margin-bottom: 6px;\"\u003eEmissions Notice — Catless Downpipe Option\u003c\/strong\u003e Our catless downpipes are for closed-course competition and off-road vehicles only. The buyer is solely responsible for compliance with all federal, state, and local emissions law.\u003c\/div\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":"No \/ No \/ No","offer_id":47299499262127,"sku":"BU-M278-TUNE-1","price":2499.0,"currency_code":"USD","in_stock":true},{"title":"No \/ No \/ Yes","offer_id":47299591536815,"sku":null,"price":2599.0,"currency_code":"USD","in_stock":true},{"title":"No \/ K\u0026N \/ No","offer_id":47299591569583,"sku":null,"price":2625.0,"currency_code":"USD","in_stock":true},{"title":"No \/ K\u0026N \/ Yes","offer_id":47299591602351,"sku":null,"price":2725.0,"currency_code":"USD","in_stock":true},{"title":"No \/ aFe \/ No","offer_id":47299591635119,"sku":null,"price":2649.0,"currency_code":"USD","in_stock":true},{"title":"No \/ aFe \/ Yes","offer_id":47299591667887,"sku":null,"price":2749.0,"currency_code":"USD","in_stock":true},{"title":"No \/ BMC \/ No","offer_id":47299591700655,"sku":null,"price":2695.0,"currency_code":"USD","in_stock":true},{"title":"No \/ BMC \/ Yes","offer_id":47299591733423,"sku":null,"price":2795.0,"currency_code":"USD","in_stock":true},{"title":"W212 E550 \/ C218 CLS550 \/ No \/ No","offer_id":47299499294895,"sku":"BU-M278-TUNE-2","price":3249.0,"currency_code":"USD","in_stock":true},{"title":"W212 E550 \/ C218 CLS550 \/ No \/ Yes","offer_id":47299591766191,"sku":null,"price":3349.0,"currency_code":"USD","in_stock":true},{"title":"W212 E550 \/ C218 CLS550 \/ K\u0026N \/ No","offer_id":47299591798959,"sku":null,"price":3375.0,"currency_code":"USD","in_stock":true},{"title":"W212 E550 \/ C218 CLS550 \/ K\u0026N \/ Yes","offer_id":47299591831727,"sku":null,"price":3475.0,"currency_code":"USD","in_stock":true},{"title":"W212 E550 \/ C218 CLS550 \/ aFe \/ No","offer_id":47299591864495,"sku":null,"price":3399.0,"currency_code":"USD","in_stock":true},{"title":"W212 E550 \/ C218 CLS550 \/ aFe \/ Yes","offer_id":47299591897263,"sku":null,"price":3499.0,"currency_code":"USD","in_stock":true},{"title":"W212 E550 \/ C218 CLS550 \/ BMC \/ No","offer_id":47299591930031,"sku":null,"price":3449.0,"currency_code":"USD","in_stock":true},{"title":"W212 E550 \/ C218 CLS550 \/ BMC \/ Yes","offer_id":47299591962799,"sku":null,"price":3549.0,"currency_code":"USD","in_stock":true},{"title":"W222 \/ C217 S550 \/ No \/ No","offer_id":47299499327663,"sku":"BU-M278-TUNE-3","price":3249.0,"currency_code":"USD","in_stock":true},{"title":"W222 \/ C217 S550 \/ No \/ Yes","offer_id":47299591995567,"sku":null,"price":3349.0,"currency_code":"USD","in_stock":true},{"title":"W222 \/ C217 S550 \/ K\u0026N \/ No","offer_id":47299592028335,"sku":null,"price":3375.0,"currency_code":"USD","in_stock":true},{"title":"W222 \/ C217 S550 \/ K\u0026N \/ Yes","offer_id":47299592061103,"sku":null,"price":3475.0,"currency_code":"USD","in_stock":true},{"title":"W222 \/ C217 S550 \/ aFe \/ No","offer_id":47299592093871,"sku":null,"price":3399.0,"currency_code":"USD","in_stock":true},{"title":"W222 \/ C217 S550 \/ aFe \/ Yes","offer_id":47299592126639,"sku":null,"price":3499.0,"currency_code":"USD","in_stock":true},{"title":"W222 \/ C217 S550 \/ BMC \/ No","offer_id":47299592159407,"sku":null,"price":3449.0,"currency_code":"USD","in_stock":true},{"title":"W222 \/ C217 S550 \/ BMC \/ Yes","offer_id":47299592192175,"sku":null,"price":3549.0,"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","url":"https:\/\/benzunitedparts.com\/products\/custom-ecu-tuning-for-m278-4-7l-v8-biturbo-e550-cls550-s550","provider":"BenzUnited Parts","version":"1.0","type":"link"}