The BMW 1 Series Sedan 125i 231hp (F52 - 2018 ->) produces 231bhp and 350Nm in standard form. Our Stage 1 ECU tuning file raises output to 270bhp and 440Nm, a gain of 39bhp and 90Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.