The BMW 3 Series 335i - N55 Twinscroll - 306hp (E90/E91 - 2010 - 2011) produces 306bhp and 400Nm in standard form. Our Stage 1 ECU tuning file raises output to 360bhp and 520Nm, a gain of 54bhp and 120Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.