The BMW 3 Series 320i 163hp (E90/E91 - 2005 - 2010) produces 163bhp and 200Nm in standard form. Our Stage 1 ECU tuning file raises output to 175bhp and 220Nm, a gain of 12bhp and 20Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.