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Do you mean "ampts"?? I believe it is 2" I used two 2" muffler clamps to keep mine from rolling around,,,,, Can I ask what are you doing with the ampts and a motorcycle baffle??
Well ampts is a motorcyle baffle just with capped end and grommet end. So I can order a baffle that is 2inch x 24inch for 18.99 cut in half and put w end caps on and have 2 - 12inch smoke tubes.