The BMW 5 Series M5 507hp (E60/61 - 2003 - 2010) produces 507bhp and 520Nm in standard form. Our Stage 1 ECU tuning file raises output to 537bhp and 550Nm, a gain of 30bhp and 30Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.