The BMW 5 Series GT 520i 170hp (F07 - 2009 - 2017) produces 170bhp and 250Nm in standard form. Our Stage 1 ECU tuning file raises output to 220bhp and 310Nm, a gain of 50bhp and 60Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.