Catalytic converters

We dealt with an EPA audit for a 2 year period while they dissected all of our exhaust products. We paid the nations top emissions lawyers a lot of money to help us during this time. Not to sound like a complete JA but what experience do you have with the EPA with respect to emissions?
Soo, is that CARB statement correct in that the CARB branded cats are the same as the "49" state cats but just with an extended warranty? That's what Walker rep told me. If someone had higher failure rates with the non CRB branded cats, that is suspect.