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well like ALL engine modifications, your gas mileage will differ whether being improved or decreased..depending on the mod of will see an improvement in overall horsepower, but not significant enough to notice vehicle improvement..the reason for an intake is to suck more air into the engine..cooler air is more dense, so stuffing cooler more dense air particles into the engine gets you the HP increases..

when u sed behind the engine, did u mean like a short ram intake? A short intake sits higher up in the engine bay while a cold air intake sits lower in the engine closer to the bottom of the engine bay to suck in the cooler air while you're driving..
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