BMW 8 Series GC 840i 340hp ECU Tuning File

The BMW 8 Series GC 840i 340hp (2019 ->) produces 340bhp and 500Nm in standard form. Our Stage 1 ECU tuning file raises output to 400bhp and 580Nm, a gain of 60bhp and 80Nm, with no hardware modifications required. The file is delivered through the ByteFlash Portal and is ready to write to the vehicle.