The BMW X3 2.5i 214hp (E83 - 2004 - 2010) produces 214bhp and 250Nm in standard form. Our Stage 1 ECU tuning file raises output to 231bhp and 271Nm, a gain of 17bhp and 21Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.