The BMW 4 Series 425D 218hp (F32/33 - 2013 - 2016) produces 218bhp and 450Nm in standard form. Our Stage 1 ECU tuning file raises output to 270bhp and 500Nm, a gain of 52bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.