The Mercedes C 43 AMG 390hp (W205 - 2018 - 2021) produces 390bhp and 520Nm in standard form. Our Stage 1 ECU tuning file raises output to 420bhp and 620Nm, a gain of 30bhp and 100Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.