I cannot begin to express my disappointment that this was not a discussion on feline cleanliness...
Quote:
Originally Posted by shovel
[...]I think they just broke and blew out the tailpipe over the years.
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Cat internal matrixes breaking into pieces was a common event on certain vehicles I used to work on. Unfortunately the result was not just a blown out cat but also a clogged muffler downstream of it.
It is possible that your cats disintegrated in small enough chunks to avoid that same outcome. But I'd suggest taking a gander at the inlet side of the downstream muffler nevertheless.