RENNtech ECU Upgrade | C218 | CLS 63 S AMG 4MATIC | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2015-2018 mercedes-benz-gt-4-door-coupe--290---2019-present--gt-53-amg-esr8544550 900rpm Note: Mercedes M157 engine

900rpm Note: Mercedes M157 engine performance when measured

536 whp @ 5

It will ONLY go back to factory setting by pressing button 2

217 - S 63 AMG Coupé 4-MATIC

and overall surface quality

RENNtech ECU Upgrade | C218 | CLS 63 S AMG 4MATIC | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2015-2018 mercedes-benz-gt-4-door-coupe--290---2019-present--gt-53-amg-esr8544550 900rpm Note: Mercedes M157 engineECU 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