The Opel Astra 2.0T OPC 200hp ((G) - 1998 - 2004) produces 200bhp and 250Nm in standard form. Our Stage 1 ECU tuning file raises output to 235bhp and 300Nm, a gain of 35bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.