The Audi A6 2.5 TDI 180hp (C5 - 1997 - 2004) produces 180bhp and 370Nm in standard form. Our Stage 1 ECU tuning file raises output to 210bhp and 420Nm, a gain of 30bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.