The Mercedes C 300 CDI 231hp (W204 - 2010 - 2014) produces 231bhp and 540Nm in standard form. Our Stage 1 ECU tuning file raises output to 280bhp and 620Nm, a gain of 49bhp and 80Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.