The BMW 5 Series 540I 340hp (G30/31 - 2016 - 2019) produces 340bhp and 450Nm in standard form. Our Stage 1 ECU tuning file raises output to 400bhp and 580Nm, a gain of 60bhp and 130Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.