The BMW 5 Series 525d 231hp (G30/31 - 2016 - 2019) produces 231bhp and 500Nm in standard form. Our Stage 1 ECU tuning file raises output to 270bhp and 575Nm, a gain of 39bhp and 75Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.