It will take some research to find the original tests mentioned in this
post, but here is what you are looking for.  I'll see what I can find on
paper element testing.

http://syclone.missouri.edu/archives/syty/9601/msg00134.html

Bill Davidson wrote:
>
> Please, I'd love to believe the K&N is both higher perfomance AND better at
> filtering out smaller particles than paper filters.... If someone has actual
> data to support that PLEASE post it to the list.
>
> Bill Davidson

--
Stuart MacMillan
Seattle

'84 Vanagon Westfalia w/2.1
'65 MGB (Daily driver since 1969)
'74 MGB GT (Restoring sloooowly)

Assisting on Restoration (and spending OPM):
'72 MGB GT (Daughter's)
'64 MGB (Son's)

Stripped and gone but their parts live on:
'68 MGB, '73 MGB, '67 MGB GT