The Audi A8 3.7 V8 260hp (D2 - 1999 - 2003) produces 260bhp and 350Nm in standard form. Our Stage 1 ECU tuning file raises output to 290bhp and 390Nm, a gain of 30bhp and 40Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.