The Alpina B6 4.4 V8 Bi-Turbo 500hp (All) produces 500bhp and 700Nm in standard form. Our Stage 1 ECU tuning file raises output to 600bhp and 800Nm, a gain of 100bhp and 100Nm, with no hardware modifications required. The file is delivered through the ByteFLASH portal and is ready to write to the vehicle.