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If it's clogged you'll see a definite drop in the RPMs like it's governed and if it's bad enough the exhaust will backfill into the engine and the engine will shut off.
OP,
Your best bet is to climb under your car and follow the exhaust/muffler and see if anything is loose or if the cat is scratched or dented where you might have scraped it. Sometimes people hit it on speed bumps etc and break the honeycomb/beading inside of it.
Last edited by my.rims.are.stock; 12-11-2010 at 09:15 PM.
Reason: Post to OP
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