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I don't want to deal with rewelding. I just want to use pipe clamps and keep it simple if possible. New EPA approved free flow cat, "so they say," is $45 on eBay.

"Truth be told," I found, months ago, a used cat and ran into the above mentioned problems. I cut and used clamps to install it but not a very good job. One pipe was not round and not a good fit and makes some noise. Now I have time, "more or less," ito install a new cat better with no leak. If I could find someone to weld it I would and forget the new cat! When your laying on your back in the driveway things are never simple.