The BMW X4 xDrive25d 231hp (G02 - 2018 ->) produces 231bhp and 500Nm in standard form. Our Stage 1 ECU tuning file raises output to 270bhp and 550Nm, 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.