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The cat is acting as a restriction and a resonator, getting rid of it (if your local laws allow) should be an easy and cheap way to wake up the engine a little.
I have cheapo aftermarket headers and b-pipe running into the stock muffler. They ran me about $160 (including new gaskets and getting the header flange re-surfaced). Above 4k rpm its too loud for my taste but it does sound pretty mean.
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