The BMW X1 xDrive25d 231hp (F48 - 2015 - 2018) produces 231bhp and 450Nm in standard form. Our Stage 1 ECU tuning file raises output to 270bhp and 500Nm, a gain of 39bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.