In my experience, JB Weld does not work for exhaust repairs. Could have been a problem with my usage though. I was using it on some newly purchased headers and and was not able to let the car sit for 24hrs.
There are wraps and stuff out there you can use but I don't know how effective they are. I would think going to a little muffler shop and having them put a new muffler on would be the easiest bet. Might be more expensive, but I don't think they're all that unreasonable and could probably be done in an hour. Plus, then you don't have to worry about the JB Weld failing or your wrap coming off.
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