Does The K&N Drop In make any difference?

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It seemed to give it a little more pep. Plus, about a 1 mpg increase. I think the greatest benefit is not having to fill up the landfills with paper filters.
 
The K&N debate goes on in a lot of car forums. The paper filter when new flows better but that doesn't last long. The K&N however, flows better when dirty, and lasts forever when maintained. Just don't overoil it.