CAI and mpg?
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It does a bit, but you must also factor in the driving style. Your most likely going to drive more agressively to hear the nice engine sound at higher RPM;s [IMG]i/expressions/face-icon-small-smile.gif[/IMG]
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You will notice a very slight decrease in miles per gallon if anything at all. Trust me, an intake or exhaust will make your foot get real heavy just because of the sound. It is worth the trade off imo.
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