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 479 LB-FT @ 1

479 LB-FT @ 1

Rated by RENNtech:               605 HP @ 5

507 HP @ 6800 RPM

matte and textured

Eliminates spongey feel

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 479 LB-FT @ 1ECU 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