The BMW 5 Series 520i 184hp (F10/11 - 2010 - 2016) produces 184bhp and 270Nm in standard form. Our Stage 1 ECU tuning file raises output to 260bhp and 420Nm, a gain of 76bhp and 150Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.