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Does your county require smog cert? It's all depend upon smog ck issue. If you are not restricted I'd remove them nasty CAT.
Also, you might want to look into EMS that can be fine tuned to get optimum results to suit your needs (both economizing or performance). Another factor is RX needs to run bit richer so you can only do so much to improve that aspect.
Good luck and let us know your progress!
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