K&n
If what you spent on your engine matters, run a good filter like WIx or Napa Gold brand.
A K&N will not filter as well, even if it is well oiled.
This link gives some good information (but the graphs may not show up correctly).
http://www.nicoclub.com/archives/kn-vs-oem-filter.html
Another one:
http://www.autoblog.com/2005/09/07/how-well-do-k-n-air-filters-work/
I stopped running K&N filters years ago.
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