open up the cat, take a screwdriver and scrape out the insides!! No i'm joking don't do that, you'll probably get cancer or something, seriously don't do it. Just buy a magnaflow, can't go wrong with them.
don't gut a cat...its detrimental to your exhaust system. instead of making it a high flow system, the laminar airflow becomes turbulant as it enters the open cat, and slows down the exhaust gases. its also illegal....here, at least. either cat. converter could work, just as long as they match up with your exhaust piping diameter.
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