The BMW 5 Series 520D 163hp (E60/61 - 2003 - 2010) produces 163bhp and 340Nm in standard form. Our Stage 1 ECU tuning file raises output to 200bhp and 420Nm, a gain of 37bhp and 80Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.