The Mercedes C 63 AMG 457hp (W204 - 2010 - 2014) produces 457bhp and 600Nm in standard form. Our Stage 1 ECU tuning file raises output to 510bhp and 650Nm, a gain of 53bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.