RENNtech Intermediate ECU Upgrade | X166 | GLS63 AMG | SUV | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2016+ mercedes-benz-e-class-coupe--238---2017-present--e-450-esr8918284 No interference with any control

No interference with any control units

The four-piece carbon fiber splitter is finished in a high gloss UV protectant clear coat

Finished off in a high-gloss UV protectant coating and assembled with custom Titanium hardware

ECU+ Upgrade | 601HP / 657TQ | Gains: +56HP / +107TQ

Crank Performance Numbers are calculated with a 18% Drivetrain loss on the 4-MATIC vehicles

RENNtech Intermediate ECU Upgrade | X166 | GLS63 AMG | SUV | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2016+ mercedes-benz-e-class-coupe--238---2017-present--e-450-esr8918284 No interference with any controlIntermediate 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