The Alpina XD3 XD3 Bi-Turbo 350hp (All) produces 350bhp and 700Nm in standard form. Our Stage 1 ECU tuning file raises output to 395bhp and 750Nm, a gain of 45bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.