The Audi A4 1.8T 20v 163hp (B6 - 2001 - 2004) produces 163bhp and 225Nm in standard form. Our Stage 1 ECU tuning file raises output to 200bhp and 320Nm, a gain of 37bhp and 95Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.