R1 Performance Package | W203 | C 55 AMG | 385 HP / 400 LB-FT | 5.5L NA V8 | M113 mercedes-benz-slc-class--172---2016-present--slc-43-amg-esr5326223 Rated by RENNtech: 400 HP

Rated by RENNtech:                400 HP @ 5

253 - GLC AMG Models SUV + Coupe

RENNtech ECU Upgrade for 231 - SL 65 AMG

up to an astonishing 582 HP and 752 lb/ft at the crank

RENNtech Stainless Steel Sport Mufflers with Valves for the C217 - S 550 Coupe BiTurbo

R1 Performance Package | W203 | C 55 AMG | 385 HP / 400 LB-FT | 5.5L NA V8 | M113 mercedes-benz-slc-class--172---2016-present--slc-43-amg-esr5326223 Rated by RENNtech: 400 HPR1 Performance Package for 203 C 55 AMG. Includes ECU Upgrade and Carbon Fiber Air Box. Up to 385HP and 400LB FT. The R1 performance package for the Mercedes 55 series engine includes our proprietary ECU upgrade in addition to our full carbon fiber airbox upgrade which offers a larger volume of incoming air for better engine breathing and improved cylinder filling. This combination that provides noticeable increases horsepower, torque and throttle