The BMW 5 Series 540i 306hp (E60/61 - 2003 - 2010) produces 306bhp and 390Nm in standard form. Our Stage 1 ECU tuning file raises output to 330bhp and 420Nm, a gain of 24bhp and 30Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.