R1 | Performance Package | C205 - C63 /S AMG | 611 HP / 672 LB-FT | 4.0L V8 BiTurbo | M177 mercedes-benz-slk-class--172---2011-2020--slk-55-amg-esr4729687 The end result is nothing

The end result is nothing short of spectacular with the RENNtech turbo package gaining up to 228 hp and 182 lb-ft

RENNtech HHT ECU Upgrade for 197 - SLS AMG

We have found the M178 engine stock performance numbers vary from the baseline figures claimed by Mercedes-Benz

Dyno measured by RENNtech:               484 HP @ 5

Intermediate ECU Upgrade | Up to 638HP / 695LB-FT | Gains: +33HP & +49LB-FT

R1 | Performance Package | C205 - C63 /S AMG | 611 HP / 672 LB-FT | 4.0L V8 BiTurbo | M177 mercedes-benz-slk-class--172---2011-2020--slk-55-amg-esr4729687 The end result is nothingRENNtech R1 Performance Package for the C205 C 63 AMG. Including: ECU, Sport Muffler, BOV Adapter. Up to: 611 HP 672 LB FT RENNtech has been at the forefront of ECU tuning since electronic engine management started to show up in vehicles during the mid 1980s! Our experience, countless hours of in house research, development and exhaustive testing ensure that our proprietary ECU upgrade offers incredible performance gains and rock solid daily driver