The Vauxhall Astra 1.7 CDTi 125hp ((J) - 2009 - 2015) produces 125bhp and 280Nm in standard form. Our Stage 1 ECU tuning file raises output to 150bhp and 330Nm, a gain of 25bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.