Originally Posted by
captain america
-there is a (or many) flaws in the filter that makes them ill-suited to racing, particularly in dirty conditions.
Winner!
Foam breathes better than cloth. A K&N filter flows better than a paper filter in a full sized car, not a foam filter. a K&N might offer better protection, but I have never seen dirt fully penetrate a properly mounted oiled foam filter.
Cloth can break down/or clog when it gets wet or muddy.
K&N filters are very heavy compared to a foam filter.