RENNtech | ECU+ Upgrade | G550 | W463 | 523 HP / 583 LB-FT | 4.0L BiTurbo V8 | M176 | up to MY2018 mercedes-benz-gls-class--167---2020-present--gls-580-esr7902471 442 LB-FT @ 1

442 LB-FT @ 1

Our intermediate level ECU upgrade for the Mercedes M157 engine still offers huge gains in performance across the entire RPM range

Rated by RENNtech:              601 HP @ 6

RENNtech strives to deliver the highest quality carbon fiber products in the industry

C63 S AMG Coupe (C205 | MY2016+ | RWD | M177 | 4

RENNtech | ECU+ Upgrade | G550 | W463 | 523 HP / 583 LB-FT | 4.0L BiTurbo V8 | M176 | up to MY2018 mercedes-benz-gls-class--167---2020-present--gls-580-esr7902471 442 LB-FT @ 1ECU+ Upgrade 523HP 583TQ Gains: +102HP +128TQ 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 a few minutes and the vehicle can be reflashed