The Mercedes ML 500 biturbo - 408hp (W166 - 2011 ->) produces 408bhp and 600Nm in standard form. Our Stage 1 ECU tuning file raises output to 510bhp and 820Nm, a gain of 102bhp and 220Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.