Originally Posted by AccordSleeper
first things first, unless your friend has one on his car most likely he doesn't have a clue as to what he is talking about.
like the people above said, most people like to here the new cool sound of the intake and end up driving more aggressively which leads to worse gas mileage. if you drove the same as you are now you would get slightly better mileage most likely.
Yeah high performance Air Intakes actually improve you MPG which is a main reason why I got mine. People that only get fascinated with hearing the sound of the intakes will in manual transmissions will ride the RPM's high to hear the roar get louder before they shift gears, or shoot off of the starting blocks even faster than before which in any car will cause their MPG to go down. If you maintain the same driving habits after you get an AEM you will definitely get better MPG.