The Audi A8 6.0i W12 (D3 - 2003 - 2010) produces 450bhp and 580Nm in standard form. Our Stage 1 ECU tuning file raises output to 475bhp and 610Nm, a gain of 25bhp and 30Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.