RENNtech ECU Upgrade | C218 | CLS 63 S AMG | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2014 mercedes-benz-clk-class--208---1997-2003--clk-55-amg-esr2755074 We have found the M278

We have found the M278 engine stock performance numbers vary from the baseline figures claimed by Mercedes Benz

The maximum power number reached with the RENNtech ECU Plus Upgrade for the C292 - GLE 43 AMG Coupe is 416 HP and 460 LB-FT

GLE 450 AMG BiTurbo (X292 - M276 Biturbo Engine) Modified Performance:

The maximum power number reached with the RENNtech ECU Plus Upgrade for the C253 - GLC 43 AMG Coupe is 416 HP and 460 LB-FT

Up to 540HP and 705 LB-FT

RENNtech ECU Upgrade | C218 | CLS 63 S AMG | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2014 mercedes-benz-clk-class--208---1997-2003--clk-55-amg-esr2755074 We have found the M278ECU Upgrade Up to 638HP 695LB FT Gains: +33HP & +49LB FT RENNtech M157 Biturbo ECU+ Upgrades are TV approved! Our intermediate level ECU+ upgrade for the Mercedes M157 Biturbo 4 MATIC engine offers huge gains in performance across the entire RPM range without sacrificing around town comfort or daily driver reliability. This is ideal for customers who want increased performance in their daily driver without worry of extra strain on driveline components