Your cat is probably fine. Its the old school version that utilizes little pellet balls as a catylist rather then a honey comb. I've never seen one clogg but rather they loose all the little balls and fail emissions. If you suspect a problem with clogging, the symptoms would be the engine cutting out or choking under full throttle or high load situations like acceleration up a hill or getting on the interstate. All low speed/low load functions will be normal.