The Vauxhall Astra 1.4 Turbo 125hp ((K) - 2015 - 2018) produces 125bhp and 245Nm in standard form. Our Stage 1 ECU tuning file raises output to 180bhp and 290Nm, a gain of 55bhp and 45Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.