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.