RENNtech ECU Upgrade | C218 | CLS63 AMG | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2012-13 mercedes-benz-glc-class-coupe--253---2016-present--glc-63-amg-esr1091906 Crank Performance Numbers are calculated

Crank Performance Numbers are calculated with a 16% Drivetrain loss on 4MATIC+ vehicles

CL 600 (C215 - M137 5

but looses the surprising brake-assist for a more mild mannered alert

85 mph W222 - AMG S63 R3 Package w/Launch Control 2

Size and Offset optimized for Mercedes-Benz SL-Class

RENNtech ECU Upgrade | C218 | CLS63 AMG | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2012-13 mercedes-benz-glc-class-coupe--253---2016-present--glc-63-amg-esr1091906 Crank Performance Numbers are calculatedECU Upgrade Up to 638HP 695TQ Gains: +88HP +151TQ RENNtech M157 Biturbo ECU Upgrades are TV approved! Our intermediate level ECU upgrade for the Mercedes M157 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