Answers: yes, but they are expensive. and they require maintainance. like anything, dont assert it and you'll pay the consequences
For the money I don't really reflect so. I remember reading a lot of other places that said that the K&N filter certainly allowed more debris to bring back through the filter than a plain old rag filter. It is hard for me to defend spending more than $30 for a filter that it will take me nearly 100k miles contained by regular filters to trade name that up. I did have a K&N on my Honda Civic near a cold air intake. I have to have it for that application though. I would collect your money and stick with broadsheet.
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