I read this:
http://theoildrop.server101.com/ubb/...;f=15;t=000265
Looking at the filtration capabilities of the K&N freaked me out. It was the worst scoring filter as far as filtering goes. The only thing it scored well on was airflow, which I consider a lower priority to filtering all the gunk out of the air.
It probably doesn't really matter, but my car is new and I tend to freak out over small things. I would just assume use a more efficient paper filter than to risk getting all sorts of gunk in my engine.