The Audi A8 2.5 TDI 150hp (1994 - 1999) produces 150bhp and 310Nm in standard form. Our Stage 1 ECU tuning file raises output to 185bhp and 380Nm, a gain of 35bhp and 70Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.