The Mercedes C 180 K - 143hp (W203 - 2004 - 2007) produces 143bhp and 220Nm in standard form. Our Stage 1 ECU tuning file raises output to 170bhp and 270Nm, a gain of 27bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.