RENNtech ECU Upgrade | C218 | CLS 63 S AMG 4MATIC | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2015-2018 mercedes-benz-cls-class--219---2006-2011--cls-500-esr9637543 X290 - GT 63 S

X290 - GT 63 S AMG 4-Door Coupe

dealer charges

Note: We have found the new M157 engine stock performance numbers vary from the baseline figures claimed by Mercedes Benz

AMG GT Black Series

RENNtech ECU Upgrade | C218 | CLS 63 S AMG 4MATIC | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2015-2018 mercedes-benz-cls-class--219---2006-2011--cls-500-esr9637543 X290 - GT 63 SECU 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