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reply: rattlin cat and exhaust

>The cats and pipes each have a triangular flang, which
>bolt together (perhaps with a gasket in between?). 

Actually, where the downpipe bolts to the cat assembly (springs)
there is a gasket.  When it goes, it sounds like a hole in the
muffler.  Each of mine have gone at 100-150k, and cost a big
$30 to fix. Check it.