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Hollowing out the cat is not only illegal, but completely unnecessary. Unless it is plugged, its not hurting mileage at all. That, plus I like clean air.
I'd leave the fast idle alone too. Not only does it heat the car up faster for defrosting and heat, it also gets the engine warm so oil flows properly, the transmission warms up and reduces drag and also so you can get into open loop and stop dumping a super rich mixture into the engine just to keep it running.
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