Hi Greg.
The way you can tell if your cat is clog is if you run your car on the
highway or any high speed and you feel it is slow accelerating. On my old 86'
Toyota Corolla I had a rattling noice when my car was idling. And it turned
out to be that one of the ceramic blocks inside the cat was broken. I hope
this helps a little.
Manny
99 Sentra with no cat =0)
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