The BMW 3 Series 320i 170hp (E46 - 1998 - 2005) produces 170bhp and 210Nm in standard form. Our Stage 1 ECU tuning file raises output to 185bhp and 230Nm, a gain of 15bhp and 20Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.