The Audi A8 4.0 TDI 275hp (D3 - 2003 - 2010) produces 275bhp and 650Nm in standard form. Our Stage 1 ECU tuning file raises output to 330bhp and 770Nm, a gain of 55bhp and 120Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.