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If your cat is bad, you'll feel a noticeable "bite" immediately after shifts. I can't really explain it, but if you pull away gently from a stop, the engine RPM will build until the shift, right after the shift, you'll immediately feel a "bite" where the engine feels bogged down.
I dealt with a bad cat on my 04. I ended up replacing it with a Magnaflow high flow one.
If you aren't having those symptoms, chances are the cat is fine.
2004 Mazda 6i ATX -Ksport - Magnaflow - Motegi -