The BMW 3 Series 325D 197hp (E90/E91 - 2005 - 2010) produces 197bhp and 400Nm in standard form. Our Stage 1 ECU tuning file raises output to 233bhp and 490Nm, a gain of 36bhp and 90Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.