R1 Performance Package | W203 | C 55 AMG | 385 HP / 400 LB-FT | 5.5L NA V8 | M113 mercedes-benz-cls-class--219---2006-2011--cls-500-esr9637543 RENNtech is the foremost authority

RENNtech is the foremost authority on transmission upgrades and has done countless rebuild and upgrades for the most demanding dealers and clients for over 35 years

This entire cartridge is then fine balanced as a complete assembly to safely allow for these increases

Fuel System Upgrade and Stage I Turbo Upgrade | Gains: +208HP

CLASS S LONG (W 221) 500 4-matic [2 Filters Required] (HP: 387 | Year: 06 > )

"Vossen" and “Forged” machined in adjacent spoke windows

R1 Performance Package | W203 | C 55 AMG | 385 HP / 400 LB-FT | 5.5L NA V8 | M113 mercedes-benz-cls-class--219---2006-2011--cls-500-esr9637543 RENNtech is the foremost authorityR1 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