The BMW 3 Series 320i (1600cc) 170hp (F3x - 2011 - 2015) produces 170bhp and 250Nm in standard form. Our Stage 1 ECU tuning file raises output to 220bhp and 315Nm, a gain of 50bhp and 65Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.