RENNtech R1 Performance Package | GLS 63 AMG | X167 | 745 HP / 767 TQ | 4.0L V8 BiTurbo | M177 | MY2021+R1 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
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