I took the old mufflers off my car because they were pretty quiet and replaced them with an american thunder flowmaster cat-back. I would like to try and sell the old mufflers but I'm not sure what kind they are, I know they are flowmasters also, but not sure if they are 3 chambers or maybe a 2 chamber 50 series since they were really quiet. Anyway to tell? I saw a patent # on them but not any part #'s.
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How to tell what mufflers I have?
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