The BMW 3 Series 318i 136hp (E46 - 1998 - 2005) produces 136bhp and 180Nm in standard form. Our Stage 1 ECU tuning file raises output to 148bhp and 195Nm, a gain of 12bhp and 15Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.