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The emissions equipment is there to increase efficiency, reduce combustion temps, and keep A/F ratios at stoichiometric. In some cases you might be able to gain a little peak horsepower, at the cost of drastically reducing FE and drastically increasing emissions. You won't find any easy efficiency gains unless there's something drastically wrong with your car, like a plugged catalyst, or by doing a complete conversion to a lean-burn or stratified-charge system.
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