The BMW 4 Series GC 418i 136hp (F36 - May/2016 ->) produces 136bhp and 220Nm in standard form. Our Stage 1 ECU tuning file raises output to 170bhp and 280Nm, a gain of 34bhp and 60Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.