The BMW 4 Series GC 440i 326hp (F36 - May/2016 ->) produces 326bhp and 450Nm in standard form. Our Stage 1 ECU tuning file raises output to 380bhp and 560Nm, a gain of 54bhp and 110Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.