The BMW 3 Series 318i 143hp (E46 - 1998 - 2005) produces 143bhp and 200Nm in standard form. Our Stage 1 ECU tuning file raises output to 156bhp and 220Nm, a gain of 13bhp and 20Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.