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

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

S63 AMG 4MATIC+ (MY2018+ | C217 | M177 | 4

Gains up to: +80 HP | +106 LB FT

engineered and manufactured in the USA using only industry leading materials to ensure long lasting durability and appearance

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