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 Dyno measured by RENNtech (peak

Dyno measured by RENNtech (peak @crank):          339 HP @ 5

442 LB-FT @ 1

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

Gloss Finish

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

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 Dyno measured by RENNtech (peakECU+ 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