The Volkswagen Golf 1.4 TSI GT 170hp (Mk5 - 2003 - 2008) produces 170bhp and 240Nm in standard form. Our Stage 1 ECU tuning file raises output to 200bhp and 300Nm, a gain of 30bhp and 60Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.