The BMW X3 xDrive M40d 326hp (G01/08 - 2017 ->) produces 326bhp and 680Nm in standard form. Our Stage 1 ECU tuning file raises output to 400bhp and 800Nm, a gain of 74bhp and 120Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.