The BMW 5 Series 540d 320hp (G30/31 - 2016 - 2019) produces 320bhp and 680Nm in standard form. Our Stage 1 ECU tuning file raises output to 400bhp and 800Nm, a gain of 80bhp and 120Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.