The BMW X4 M40d 326hp (G02 - 2018 ->) produces 326bhp and 680Nm in standard form. Our Stage 1 ECU tuning file raises output to 380bhp and 750Nm, a gain of 54bhp and 70Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.