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A little better than 20 years ago I used to run a flow bench. K and N were becoming very popular touting all kinds of performance benefits and better filtering. After testing them I would never use one. We could not use them on the flow bench (well not oiled anyway) as it would damage our equipment. The 1hp gain or so that you might have got from the "free flowing" element was quickly wiped out after just a few miles when your intake tract was coated with oil residue and slowing the air flow down and required intake manifold removal and cleaning to reverse. I am personally not a fan and could not tell you if they have changed in the last 20 years as I would not touch one with a 10 foot pole. Oh, and stay away from purchasing a car that has had one in it, having worked in the auto service industry I can assure you that 99% of people who run a K&N on their cars do not take it out and clean it or reoil it at anywhere near as often as necessary.
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