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 218 - CLS 63 AMG

218 - CLS 63 AMG BiTurbo FaceLift (2015+)

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

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

Our proprietary ECU upgrade for the Mercedes M276 engine offers huge gains in performance across the entire RPM range without sacrificing around town comfort or daily driver reliability

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 218 - CLS 63 AMGECU+ 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