The BMW 4 Series GC 430i 252hp (F36 - May/2016 ->) produces 252bhp and 350Nm in standard form. Our Stage 1 ECU tuning file raises output to 287bhp and 450Nm, a gain of 35bhp and 100Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.