The BMW X5 4.8i 355hp (E70 - 2007 - 2010) produces 355bhp and 475Nm in standard form. Our Stage 1 ECU tuning file raises output to 385bhp and 500Nm, a gain of 30bhp and 25Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.