RENNtech R1 Performance Package | GLS 63 AMG | X167 | 745 HP / 767 TQ | 4.0L V8 BiTurbo | M177 | MY2021+ mercedes-benz-cls-class--218---2015-2018--cls-550-biturbo-esr2270978 Up to 355HP

Up to 355HP

RS7 (C8 4K)

All replacement cores are completely disassembled

The RENNtech upgraded M278 now produces up to 540 HP and 705 LB-FT at crank

RENNtech R1 Performance Package | GLS 63 AMG | X167 | 745 HP / 767 TQ | 4.0L V8 BiTurbo | M177 | MY2021+ mercedes-benz-cls-class--218---2015-2018--cls-550-biturbo-esr2270978 Up to 355HPR1 Performance Package for AMG GLS 63: ECU Upgrade (HHT), Transmission Control Unit Upgrade (TCU), Off Valves (BOV), Exhaust Valve Module (EVM), BMC Air Filters The Mercedes AMG GLS 63 (X167) is powered by the latest V8 BiTurbo engine developed by AMG, the companys Affalterbach based performance division and long fabled engine builder. The result is nothing short of spectacular and the 4. 0L V8 BiTurbo engine is an incredible platform to build