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I bought the AEM CAI in 2006 for my car and was wary of the dry filter due to the sandy soil that I have to drive on..... I must admit that I never detected any grit reaching the throttle body with it but I had to replace it after it was damaged and went with a Spectre brand oiled cotton filter from Auto Zone..... I now have the K&N that came on my Kraft Werks super charger and felt the need to change the oil due to feeling some fine grit between my fingertips from off of the dipstick.... I don't think it had to do with the filter because I always coat the inside of the intake tube at both ends with grease and found no grit there so it was probably grit on my fingers that was on my fingers and was loosened by the oil off of the stick .... I cleaned the filter anyway and found that it had stopped a quite a bit of sand and dust after only 2400 miles.... Unless you are driving on dry gravel or sand either will work but I have more confidence in oiled cotton and have used them on all of my cars and motorcycles for street use for over 20 years.... Check out the Spectre P3 that is sold at Auto Zone is a great design with a funnel shaped base and priced a lot cheaper than K&N but K&N oil is better because it is red in color and allows you to see that the filter is fully covered when re oiling it.... I know guys that replaced the mesh wire flame arrester on Jet-Skis with K&N filters to smooth the intake flow and K&N sold a Filter Charger Kit for street bikes in the 70s and 80s that included larger main jets to correct A/F ratios to prevent a lean mixture..... They last forever, improve performance, will go a very long time without maintenance and do what they are supposed to, stop dirt and grit from getting inside your engine.
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