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those are actually resonators or test pipes. Not CARB and 99% of the time won't pass a sniffer
If you want a real cat get a real high flow cat. High flow cats will still have baffles and all the other garbage in it but will flow better as well as doing it's job and keeping your car a little quieter.
When I finally do make my exhaust for the Audi, it will has a real 3" cat, and probably a resonator AKA "hi flo cat"
EDIT***heres a "real" catalytic converter.
http://cgi.ebay.com/ebaymotors/2-5-2-1-2-C...sspagenameZWDVW