The BMW 3 Series GT 340i Performance Package 360hp (F34 LCI - 2016 ->) produces 360bhp and 500Nm in standard form. Our Stage 1 ECU tuning file raises output to 400bhp and 580Nm, a gain of 40bhp and 80Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.