The BMW 3 Series 335i - N54 PPK - 326hp (E90/E91 - 2005 - 2010) produces 326bhp and 450Nm in standard form. Our Stage 1 ECU tuning file raises output to 370bhp and 500Nm, a gain of 44bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.