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NAPA sells a universal Cat Converter with an installation kit seperate.
Buy the Install kit so you have the right fittings & buy the correct size pipe to replace the cat!
I made my own by making a fixture out of 1"x 6" wood and cutting the flanges off my old CC. Took it to a exhaust shop and ask them to bend and weld a 2 1/2" pipe between the two flanges mounted on the wood fixture. Fit like a glove, cost $10
Check out ebay. I bought mine there but not from this particular seller. test pipe
What a piece of garbage that one is. Look at the bend in it, it loses 20-30 of its I.D. I would continue the search for a mandrel bent pipe or just use a hollowed out converter for your "testing".