David Cooley reported on a magazine test of aftermarket air filters.
  The paper filters were respectable, but the K&N and Accell filters
  flowed almost 3 times as much air when dirty as clean paper filters
  of the same size. The K&N passed less particulate matter than the
  paper filter; as it got dirtier outside, they sprayed on a new coat
  of oil (without cleaning) and found it filtered even better.


















Are K&N filters worth it?
   K&N filters change your engine sound, rarely need replacement,
  and flow better when dirty. Other than that, you may not notice much
  difference unless you have a high-efficiency exhaust and performance
  engine.
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Internal combustion air filters
The combustion air filter prevents abrasive particulate matter from entering the engine's cylinders, where it would cause mechanical wear and oil contamination. Known as Engine air induction systems (AIS), they are typically constructed of paper or felt.

Most fuel injected vehicles use a pleated paper filter element in the form of a flat panel. This filter is usually placed inside a plastic box connected to the throttle body with an intake tube.

Older vehicles that use carburetors or throttle body fuel injection typically use a cylindrical air filter, usually a few inches high and between 6 and 16 inches in diameter. This is positioned above the carburetor or throttle body, usually in a metal or plastic container which may incorporate ducting to provide cool and/or warm inlet air, and secured with a metal or plastic lid.
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Automotive cabin air filters
The cabin air filter is typically a pleated-paper filter that is placed in the outside-air intake for the vehicle's passenger compartment. Some of these filters are rectangular and similar in shape to the combustion air filter. Others are uniquely shaped to fit the available space of particular vehicles' outside-air intakes. Being a relatively recent addition to automobile equipment, this filter is often overlooked[citation needed]. Clogged or dirty cabin air filters can significantly reduce airflow from the cabin vents, as well as introduce allergens into the cabin air stream.
From Wikipedia, the free encyclopedia
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