The BMW X4 M40i 360hp (F26 - 2014 - 2017) produces 360bhp and 500Nm in standard form. Our Stage 1 ECU tuning file raises output to 400bhp and 580Nm, a gain of 40bhp and 80Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.