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Order This File Ask a QuestionThe Chevrolet Trailblazer 4.2i 279hp (All) produces 279bhp and 373Nm in standard form. Our Stage 1 ECU tuning file raises output to 300bhp and 395Nm, a gain of 21bhp and 22Nm, with no hardware modifications required. The file is delivered through the ByteFlash Portal and is ready to write to the vehicle.