Good high flow cats are important if you have headers and a supercharger. You can measure a cats flow by taking a temp reading before and after the cat--if the delta T is high, something is clogging the cat.
I have heard that the H2 stock cats have had some problems. My race exhaust guy (not just a metal bender) showed me where one of my stock cats was already breaking down after they were replaced. Do I have any data on this breakdown rate--NO-I am not trying to scare anyone.
If you do push a lot of air, do have your cats checked now and then--it will prevent excessive heat upstream and save some valves or a head gasket.
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