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Order This File Ask a QuestionThe Chevrolet Trailblazer 5.3 V8 305hp (All) produces 305bhp and 447Nm in standard form. Our Stage 1 ECU tuning file raises output to 325bhp and 470Nm, a gain of 20bhp and 23Nm, with no hardware modifications required. The file is delivered through the ByteFlash Portal and is ready to write to the vehicle.