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 Up to 380HP and 410

Up to 380HP and 410 LB-FT LB-FT

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

Note: Mercedes M177 engine performance when measured on the dyno obtains higher power numbers than rated from factory

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

No interference with any control units

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 Up to 380HP and 410Intermediate 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