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Order This File Ask a QuestionThe Alpina B3 S 3.5i 400hp (All) produces 400bhp and 540Nm in standard form. Our Stage 1 ECU tuning file raises output to 450bhp and 600Nm, a gain of 50bhp and 60Nm, with no hardware modifications required. The file is delivered through the ByteFlash Portal and is ready to write to the vehicle.