The BMW 4 Series 420d 163hp (F32/33 - May/2016 - 2019) produces 163bhp and 380Nm in standard form. Our Stage 1 ECU tuning file raises output to 220bhp and 440Nm, a gain of 57bhp and 60Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.