The Mercedes S 320 CDI 197hp (W220 - 1997 - 2002) produces 197bhp and 470Nm in standard form. Our Stage 1 ECU tuning file raises output to 235bhp and 550Nm, a gain of 38bhp and 80Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.