The Alpina B6 4.4 V8 Bi-Turbo 600hp (All) produces 600bhp and 800Nm in standard form. Our Stage 1 ECU tuning file raises output to 680bhp and 850Nm, a gain of 80bhp and 50Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.