The BMW X6 M 555hp (E71 - 2008 - 2014) produces 555bhp and 680Nm in standard form. Our Stage 1 ECU tuning file raises output to 610bhp and 800Nm, a gain of 55bhp and 120Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.