The BMW 6 Series 650ci 367hp (E63 - 2004 - 2010) produces 367bhp and 490Nm in standard form. Our Stage 1 ECU tuning file raises output to 390bhp and 525Nm, a gain of 23bhp and 35Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.