RENNtech EVM | Exhaust Valve Module | Audi | S8 (D3/4E) mercedes-benz-e-class-sedan--211---2003-2009--e63-amg-esr3705573 Not just a pretty front

Not just a pretty front facia

Our proprietary ECU+ upgrade for the Mercedes M157 engine offers huge gains in performance across the entire RPM range without sacrificing around town comfort or daily driver reliability

197 - SLS AMG GT

Rated by Mercedes-Benz:      556 HP @ 5

RENNtech EVM | Exhaust Valve Module | Audi | S8 (D3/4E) mercedes-benz-e-class-sedan--211---2003-2009--e63-amg-esr3705573 Not just a pretty frontEVM Exhaust Valve Module (Remote Controlled) NOT SO FUN FACT: Sportscars equipped with factory exhaust valves, with or without a center console button to open or close them, the factory settings do NOT allow the valves to fully open unless certain speed and or RPM have been reached. For example, while cruising the exhaust valves will never fully open! THE EVM SOLUTION: By pressing Button 1 on the remote control, RENNtechs Exhaust Valve Module (EVM)