RENNtech Intermediate ECU Upgrade | X166 | GLS63 AMG | SUV | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2016+ maserati-mc20-esr2615562 CAM) is available should you

CAM) is available should you wish to retain full camera view angle

No permanent modifications to the vehicle are required

The OG RENNtech logo underscores Hartmut Feyhl's direct lineage from AMG and his role in shaping the Hammer legacy

RENNtech "Bench Flash -Requires Removal of ECU for the 215 - CL 500

RENNtech Intermediate ECU Upgrade | X166 | GLS63 AMG | SUV | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2016+ maserati-mc20-esr2615562 CAM) is available should youIntermediate ECU Upgrade Up to 638HP 695LB FT Gains: +33HP & +69LB FT RENNtech M157 Biturbo ECU+ Upgrades are TV approved! Our proprietary ECU+ upgrade for the Mercedes M157 Biturbo 4 MATIC engine offers huge gains in performance across the entire RPM range without sacrificing around town comfort or daily driver reliability. Our intermediate level ECU upgrade offers huge gains in performance across the entire RPM range without sacrificing around town