RENNtech | ECU+ Upgrade | C63 /S AMG | Sedan | W205 | 601 HP / 657 LB-FT | 4.0L BiTurbo V8 | M177 | MY2015-2021 mercedes-benz-sls-amg-gt--197---2012-2014--esr9215445 After changing and saving the

After changing and saving the settings

0L V8 BiTurbo) Modified Performance (at crank):

Rated by RENNtech:               638 HP @ 5

Activation completely independent regardless of drive mode

RENNtech | ECU+ Upgrade | C63 /S AMG | Sedan | W205 | 601 HP / 657 LB-FT | 4.0L BiTurbo V8 | M177 | MY2015-2021 mercedes-benz-sls-amg-gt--197---2012-2014--esr9215445 After changing and saving theECU+ Upgrade 601HP 657TQ Gains: +56HP +107TQ RENNtech tuning products are certified to meet CARB standards in all 50 States. RENNtech HHT (hand held tuner) allows you the unlimited ability to switch between tuned and stock ECU programming and requires no ECU removal! Our proprietary tuning module stores both the RENNtech tuned file and your vehicles stock file. The module plugs directly into the OBD2 port and delivers the file you choose directly to