The BMW 3 Series 335i Active Hybrid 340hp (F3x - 2011 - 2015) produces 340bhp and 400Nm in standard form. Our Stage 1 ECU tuning file raises output to 400bhp and 520Nm, a gain of 60bhp and 120Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.