RENNtech | HHT | ECU Upgrade | SLS AMG GT | C197 | 593HP/495LB-FT | 6.3L V8 N/A | M159 apparel The RENNtech Stage I turbos

The RENNtech Stage I turbos spool quicker

RENNtech is proud to introduce an all new rear decklid spoiler design for the Mercedes-Benz CL-class

Crank Performance Numbers are calculated with a 14% Drivetrain loss on RWD vehicles

Rated by RENNtech (peak @wheel):              419 whp @ 6

RENNtech | HHT | ECU Upgrade | SLS AMG GT | C197 | 593HP/495LB-FT | 6.3L V8 N/A | M159 apparel The RENNtech Stage I turbosRENNtech HHT ECU Upgrade for 197 SLS AMG GT. Up to 593HP and 495LB FT. Gains: +10HP & +14LB FT 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 the ECU. Programming takes only