RENNtech ECU+ Upgrade | X166 | GL63 AMG | SUV | 669 HP / 734 LB-FT | M157 | 5.5L V8 BiTurbo mclaren-720s-esr3513048 Dyno measured by RENNtech (peak):

Dyno measured by RENNtech (peak):               526 HP @ 6

Intermediate ECU Upgrade | Up to 638HP / 695LB-FT | Gains: +33HP & +25LB-FT

ECU+ Upgrade | Up to 669HP / 734TQ | Gains: +106 HP / +140TQ

G63 AMG (MY2019+ | W463 | M177 | 4

RENNtech ECU+ Upgrade | X166 | GL63 AMG | SUV | 669 HP / 734 LB-FT | M157 | 5.5L V8 BiTurbo mclaren-720s-esr3513048 Dyno measured by RENNtech (peak):ECU+ Upgrade Up to 669HP 734LB FT Gains: +95HP & +111LB 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 a few minutes and the vehicle can