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I'm not sure I quite buy that. An engine that is already at an operating temperature of 200 degree or more is not going to have problems igniting the charge from a "cold air" intake because by the time is actually gets to the engine, it's plenty warm. Maybe this wouldn't be true if temps are down below say 40 degrees, but still I'd have to see really solid data showing good gains to believe this is beneficial.
Cold air intakes are good for both power and mpg. A denser charge is a good thing.
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1988 rx7 convertible. Streetported, racing beat header and presilencer replacing all 3 catalytic converters. Atkins 6 port sleeves. K&N cone filter intake. 22mpg average, 27mpg max. Spreadsheet (updated regularly):
https://dl.dropbox.com/u/5310442/198...%20mileage.xls
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