The BMW 4 Series 430i 258hp (G22 - 2020 ->) produces 258bhp and 400Nm in standard form. Our Stage 1 ECU tuning file raises output to 287bhp and 450Nm, a gain of 29bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.