The BMW 3 Series GT 330D 258hp (F34 - 2012 - 2015) produces 258bhp and 560Nm in standard form. Our Stage 1 ECU tuning file raises output to 310bhp and 650Nm, a gain of 52bhp and 90Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.