The BMW 4 Series M440i 374hp (G22 - 2020 - 2023) produces 374bhp and 500Nm in standard form. Our Stage 1 ECU tuning file raises output to 420bhp and 575Nm, a gain of 46bhp and 75Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.