The Alpina XD4 3.0 Quad-Turbo 388hp (All) produces 388bhp and 770Nm in standard form. Our Stage 1 ECU tuning file raises output to 450bhp and 850Nm, a gain of 62bhp and 80Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.