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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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Shaun, what can happen is, the ceramic center starts new with the aspect ratio of a soup can. It slowly breaks-down until it has the aspect ratio of a tuna can. ..at which point it can flip sideways, and almost completely block the cat exit to the tailpipe.
I had this happen once. So, I took the cat off, set it in a garbage can, and rammed a crowbar down the center, to brreak-up what was left of the ceramic. (re-installed - ran great)
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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