RENNtech Intermediate ECU Upgrade | X166 | GLS63 AMG | SUV | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2016+ maserati-mc20-esr2615562 The maximum power number reached

The maximum power number reached with the RENNtech ECU Upgrade for the E400 is 392 HP and 463 LB-FT

521 LB-FT @ 3

Carrera GTS Cabriolet

not all states can be supplied with the full power Upgrade

These pieces were designed to function in complete harmony with one another and when combined create a  unique and aggressive aerodynamic package

RENNtech Intermediate ECU Upgrade | X166 | GLS63 AMG | SUV | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2016+ maserati-mc20-esr2615562 The maximum power number reachedIntermediate 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