The Mercedes ML 400 CDI 250hp (W163 - 1997 - 2005) produces 250bhp and 560Nm in standard form. Our Stage 1 ECU tuning file raises output to 290bhp and 650Nm, a gain of 40bhp and 90Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.