The BMW 4 Series M4 - 431hp (F32/33 - 2013 - 2016) produces 431bhp and 600Nm in standard form. Our Stage 1 ECU tuning file raises output to 500bhp and 650Nm, a gain of 69bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.