Not Ranked
I remember the thread Turk referred to and it basically said that as long as you don't use a really restrictive air filter like some of the small ones that are for show you won't gain any big amount. So far as driving without a filter, not only is it a possible fire hazard as mentioned by southernfriedcj but you get every bug and anything else that comes through the hood scoop into the engine. Not at all a good idea here where it is so dusty.
Ron
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