The Audi A6 1.8 T 150hp (C5 - 1997 - 2004) produces 150bhp and 210Nm in standard form. Our Stage 1 ECU tuning file raises output to 200bhp and 320Nm, a gain of 50bhp and 110Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.