The Alpina B7 B7 Bi-Turbo 540hp (All) produces 540bhp and 730Nm in standard form. Our Stage 1 ECU tuning file raises output to 575bhp and 800Nm, a gain of 35bhp and 70Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.