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Is it common for OEM mufflers to go bad?

1258 Views 12 Replies 9 Participants Last post by  focusmaniaczx3
I think I have a rattle inside my muffler at lower rpms, or an exhaust leak in the muffler somewhere. Is it normal for them to go bad? Any lifetime warranty? Cheap replacements?
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Time for a catback!!! [driving]
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