Originally posted by tw0wheelin:
clogged cats was my first thought, but I've been burned by them before.  If the dealer replaces the main cat, make sure they check and or replace the pre-cats because they are probably the cause. The pre-cats crumble and cause the main cat to clog up. They will continue to crumble and cause problems unless replaced or gutted. Once your past 80K, they won't touch it on warranty.
True! I second that. 
Phillip Jackson
`98 Mystique LS
262K+ and counting...
ATX rebuilt @ 151K
"This storm has broken me, my only friend!" RIP Dime
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