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Old 03-27-2008, 11:04 PM   #23 (permalink)
Join Date: Feb 2008
Location: california
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Every car I've had thus far got better fuel economy with cold air intake of my own design. Warm air might help fuel vaporize better in extreme cold but it also takes more energy (pumping losses) to breath in that air. If your car has a knock sensor, hot air will cause the computer to retard timing and reduce power hence efficiency.
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