Interesting- I don't think mine is totally clogged. I had a clogged one on my 04, I could feel it struggle to accelerate and it used to overheat on the highway until I replaced it.
This one doesn't feel like that AT ALL, in fact, if not for the light I wouldn't think there's anything wrong, the car performance and mpg is excellent.
Passing inspection isn't an issue, I reset it with my ODBii computer and it stayed off for over 200+ miles! So I think it's a minor issue maybe... I haven't tried Cataclean yet, I'm afraid to try anything because last time mine had a real problem and all the additives made it worse!
(the front cat burnt out and pieces clogged the down stream one, causing major exhaust back up! I had tried some fuel additives to "burn it out" but the mechanic told me it probably broke it faster, it definitely got worse after that)
This seems minor, I just wanted to hear some Cataclean success on what appears to be a more minor p0430!