The BMW 3 Series 325i - N52 - 211hp (E90/E91 - 2005 - 2010) produces 211bhp and 250Nm in standard form. Our Stage 1 ECU tuning file raises output to 232bhp and 275Nm, a gain of 21bhp and 25Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.