RENNtech ECU Upgrade | W212 | E 550 | 480HP / 605 LB-FT | 4.7L V8 BiTurbo | M278 | MY2012-2013 mercedes-benz-gl-class--166---2013-2016--gl-550-biturbo-4matic-esr9025016 RENNtech takes no responsibility for

RENNtech takes no responsibility for any accidents or harm caused while using this product

C217 - S 63 AMG Coupe

C 350 (C203) Stock Performance:

C 400 BiTurbo (W205 - M276 Biturbo 4-MATIC Engine) Modified Performance:

Gains: up to +208HP | +153LB-FT

RENNtech ECU Upgrade | W212 | E 550 | 480HP / 605 LB-FT | 4.7L V8 BiTurbo | M278 | MY2012-2013 mercedes-benz-gl-class--166---2013-2016--gl-550-biturbo-4matic-esr9025016 RENNtech takes no responsibility forECU Upgrade 480HP 605LB FT Gains: +45HP +162LB FT Our intermediate level ECU upgrade for the Mercedes M278 engine still offers huge gains in performance across the entire RPM range, but with a slightly reduced peak HP and torque from our standard tune. This is ideal for customers who want increased performance in their daily driver without worry of extra strain on driveline components or for areas and countries with extreme altitudes, temperatures or