The Mercedes C 250 CDI 204hp (W205 - 2014 - 2018) produces 204bhp and 500Nm in standard form. Our Stage 1 ECU tuning file raises output to 240bhp and 550Nm, a gain of 36bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.