Updated 8-12-08
These are not really good pictures, it is pretty 
hard to see the small holes I suggest you hold
your filter up to the light after it is washed
and dried, Take your time and look at it for
 30 seconds or so.




I like to stop dirt particles measured in microns not thousands of a inch.
Even after oiling the filter with K&N oil you still see open holes,
no matter how much oil is sprayed on the filter I still see open holes
in the filter media.

Take the test for yourself

K&N on a FL250 

Why use foam filters (1-7-01)

I read this in Dirt Wheels magazine 

This is what CT Racing has to say about K&N filters

Big Tom's thoughts on filters

Look at Mudboggers K&N it was used with a PreCharger Filter Wrap Updated 8-12-08