The BMW 5 Series 520i 184hp (G30/31 LCI - 2020 ->) produces 184bhp and 290Nm in standard form. Our Stage 1 ECU tuning file raises output to 250bhp and 440Nm, a gain of 66bhp and 150Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.