The Opel Astra 1.7 CDTi 80hp ((G) - 1998 - 2004) produces 80bhp and 170Nm in standard form. Our Stage 1 ECU tuning file raises output to 105bhp and 230Nm, a gain of 25bhp and 60Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.