There are two types of custom air intakes:
Cold air intake
Short ram intake
You would choose your type of intake depending on the tempature where you live. If it's hot outside then you would want to use the cold air intake, and if it's cold outside you would use the short ram intake. The reason for this is you want cold air going in to the engine, the colder the air the better the performance, to a point. If you live in freezing tempature then that's a little to cold and you would want to use the short ram system.With the cold air intake the idea is to draw in air as far away from the motor as possible to get the coldest air possible. With the short ram intake you want to draw your air from near the engine where it's a little warmer.
So with cooler air we get better performance, but there is another benifit! When car manufactures build a car they want it to be as quite as possible, and how they do this is reduce the air flow and run it through lengths of tubing. So by removing the OEM air box and intake tube and replacing it with a K&N or Spectre intake tube and cone filter you make it easier for your car to breathe.
I know I said this is for everyone and you are thinking I don't care about performance I want gas mileage! Well, if the engine performs better and doesn't have to work as hard, in turn it will use less gas to power itself.
AND, on top of all this the different types of intake tubes and filter they have available giver your engine a personalized custom look that anyone can appreciate. For detailed intsructions on how to remove the stock intake and filter box and to purchase the custom intake visit my website at http://www.compactuner.com
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Source: http://www.articlealley.com/article_965464_31.html
Source: http://www.articlealley.com/article_965464_31.html
