The Alpina B5 4.4 V8 Bi-Turbo 600hp (F10/11 LCI - 2013 - 2017) 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.