The BMW 3 Series 335D 306hp (E90/E91 - 2010 - 2011) produces 306bhp and 600Nm in standard form. Our Stage 1 ECU tuning file raises output to 340bhp and 680Nm, a gain of 34bhp and 80Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.