Did you know that the average car or truck air filter needs to be replaced on a yearly basis, regardless of how dirty it looks? That air filter replacement interval drops even more if the vehicle is used in dusty areas or extreme-use situations. Your auto air filter plugs up and gradually loses its efficiency over time, flowing less and less air until your car or truck is literally choked. The result is poor fuel economy and sluggish performance even though your air filter may not look that dirty. The answer is simple and inexpensive: A replacement air filter. For those of you who would like to extract more power from your vehicle, a high-performance air filter, sometimes called a high-flow air filter, is the quickest way to start.