The BMW 3 Series 325i - N53 - 211hp (E90/E91 - 2010 - 2011) produces 211bhp and 270Nm in standard form. Our Stage 1 ECU tuning file raises output to 265bhp and 315Nm, a gain of 54bhp and 45Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.