RENNtech EVM | Exhaust Valve Module | 172 - SLC 43 AMG; 253 - GLC AMG Models SUV + Coupe mercedes-benz-s-class-coupe-140---1992-1999--sec-600-esr4155053 The R2 performance package is

The R2 performance package is the next step up from our R1 performance package and includes our proprietary ECU tune

900rpm Note: Mercedes M278 engine performance when measured

ECU Upgrade | Up to 638HP / 695TQ | Gains: +88HP / +151TQ

This system significantly reduces the overall vehicle weight and delivers extra power and a sporty sound

Rated by RENNtech (peak @crank):              818 HP @ 6

RENNtech EVM | Exhaust Valve Module | 172 - SLC 43 AMG; 253 - GLC AMG Models SUV + Coupe mercedes-benz-s-class-coupe-140---1992-1999--sec-600-esr4155053 The R2 performance package isRENNtech Exhaust Valve Module Permanently Open Exhaust Flaps. 172 SLC 43 AMG; 253 GLC AMG Models SUV + Coupe EVM Exhaust Valve Module (Remote Controlled) NOT SO FUN FACT: If your Mercedes AMG is equipped with factory exhaust valves, with or without a center console button to open or close them, factory settings do NOT allow the flaps to fully open unless certain speed and or RPM have been reached. For example, while cruising the exhaust flaps will