The Mercedes C 63 AMG 476hp (W205 - 2018 - 2021) produces 476bhp and 700Nm in standard form. Our Stage 1 ECU tuning file raises output to 570bhp and 820Nm, a gain of 94bhp and 120Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.