I have to clarify that this collar is definitely not the size you think it is based on the measurements in the chart. can fit a 5" muffler if you want bolt lugs spaced more than 4". I'm not sure what application would require that much spacing from the mounting lugs, but the picture should be a lot clearer about the Dimensions. Truly "closed" diameter is about 4". I hope this review will save someone from the same mistake as me. Aside from the sizing issues, the quality seems to be there. Although I can't run a proper test because, well, you know.
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