RENNtech ECU Upgrade for SLS Black Series (C197- 657 HP / 490 LB-FT) mercedes-benz-g-class--463---1990-2018--g-65-amg-esr1373241 the S 550 gains up

the S 550 gains up to 66 HP and 139 LB-FT

The unit also supports speed-dependant lowering that allows the vehicle to return to its factory ride-height at a pre-set speed

0L V8 BiTurbo

+26 HP & 33 TQ

With the RENNtech ECU Plus Upgrade the W205 - C 43 AMG Sedan gains up to +41 HP and +62 LB-FT

RENNtech ECU Upgrade for SLS Black Series (C197- 657 HP / 490 LB-FT) mercedes-benz-g-class--463---1990-2018--g-65-amg-esr1373241 the S 550 gains upRENNtech 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 a few minutes and the vehicle can be reflashed at any time as many times as you wish. The