The BMW X3 xDrive M40d MHEV 340hp (G01/08 - 2017 ->) produces 340bhp and 700Nm in standard form. Our Stage 1 ECU tuning file raises output to 400bhp and 800Nm, a gain of 60bhp and 100Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.