The BMW X6 4.0D 306hp (E71 - 2008 - 2014) produces 306bhp and 600Nm in standard form. Our Stage 1 ECU tuning file raises output to 350bhp and 680Nm, a gain of 44bhp and 80Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.