The BMW X3 1.8D 136hp (E83 - 2004 - 2010) produces 136bhp and 300Nm in standard form. Our Stage 1 ECU tuning file raises output to 180bhp and 390Nm, a gain of 44bhp and 90Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.