The Volkswagen Golf GTI 1.8T 20v 180hp (Mk4 - 1997 - 2003) produces 180bhp and 235Nm in standard form. Our Stage 1 ECU tuning file raises output to 192bhp and 310Nm, a gain of 12bhp and 75Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.