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Order This File Ask a QuestionThe DAF XF 381 381hp (All) produces 381bhp and 1750Nm in standard form. Our Stage 1 ECU tuning file raises output to 455bhp and 2050Nm, a gain of 74bhp and 300Nm, with no hardware modifications required. The file is delivered through the ByteFlash Portal and is ready to write to the vehicle.