The BMW 4 Series 435i 306hp (F32/33 - 2013 - 2016) produces 306bhp and 400Nm in standard form. Our Stage 1 ECU tuning file raises output to 365bhp and 500Nm, a gain of 59bhp and 100Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.