The BMW X4 3.5d 313hp (F26 - 2014 - 2017) produces 313bhp and 630Nm in standard form. Our Stage 1 ECU tuning file raises output to 360bhp and 760Nm, a gain of 47bhp and 130Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.