The BMW 3 Series 330i 258hp (E90/E91 - 2005 - 2010) produces 258bhp and 300Nm in standard form. Our Stage 1 ECU tuning file raises output to 274bhp and 325Nm, a gain of 16bhp and 25Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.