The Mercedes C 400 - 333hp (W205 - 2018 - 2021) produces 333bhp and 480Nm in standard form. Our Stage 1 ECU tuning file raises output to 415bhp and 600Nm, a gain of 82bhp and 120Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.