The Volkswagen Golf 1.9 SDI 68hp (Mk4 - 1997 - 2003) produces 68bhp and 133Nm in standard form. Our Stage 1 ECU tuning file raises output to 80bhp and 150Nm, a gain of 12bhp and 17Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.