The Mercedes S 320 CDI 204hp (W220 - 2002 - 2005) produces 204bhp and 500Nm in standard form. Our Stage 1 ECU tuning file raises output to 240bhp and 570Nm, a gain of 36bhp and 70Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.