The Mercedes ML 63 AMG 525hp (W166 - 2011 ->) produces 525bhp and 700Nm in standard form. Our Stage 1 ECU tuning file raises output to 650bhp and 920Nm, a gain of 125bhp and 220Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.