RENNtech Intermediate ECU Upgrade | X166 | GL63 AMG | SUV | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2013-15 mercedes-benz-gls-class--167---2020-present--gls-63-amg-esr1798052 in order to create a

in order to create a smooth and high gloss finish

Kit Specifications:

Turbo GT (MY2021+)

Confirm If Your Car Is Equipped With Factory Exhaust Valves*

RENNtech Intermediate ECU Upgrade | X166 | GL63 AMG | SUV | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2013-15 mercedes-benz-gls-class--167---2020-present--gls-63-amg-esr1798052 in order to create aIntermediate ECU Upgrade Up to 638HP 695LB FT Gains: +64HP & +72LB 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