For those of you who want to know how much dirt a K&N filter lets by and how much of a difference the foam wrap makes on you K&N filter...here you go...take a look at silicon levels before and after, it drastically dropped silicon (dirt) to a level I can deal with in the sample and in turn all wear metals dropped significantly as well, the high lead is from a couple tanks of race gas. So for all you guys that think a K&N filters well here is the proof. Just thought I would share it with you guys.
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