15" Long X .990" ID 3 Stage Straight Header for the Honda GX390.
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Used to build ultralight power plant on Duromax 18hp engine. Weighs 1lb. Stock exhaust weighs 5.5 lbs. Bolted right on. Very pleased so far.
Was not sure if it would work on a duromax 18hp. I did a shot in the dark. Worked great