The BMW 4 Series 425d 224hp (F32/33 - May/2016 - 2019) produces 224bhp and 450Nm in standard form. Our Stage 1 ECU tuning file raises output to 270bhp and 500Nm, a gain of 46bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.