The BMW X5 M F85 - 4.4 Bi-Turbo 575hp (All) produces 575bhp and 750Nm in standard form. Our Stage 1 ECU tuning file raises output to 680bhp and 850Nm, a gain of 105bhp and 100Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.