The BMW 3 Series 320D 136hp (E46 - 1998 - 2005) produces 136bhp and 280Nm in standard form. Our Stage 1 ECU tuning file raises output to 168bhp and 360Nm, a gain of 32bhp and 80Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.