It is very deceptive wording in the K&N paperwork. Allow me to clarify:
The K&N filter actually filters the air better as the filter gets dirty. This is true because the design of the filter makes the dirt particles that become trapped act as another filter. Thus, the more dirt, to a point, that collects on the filter, the better it actually filters the air that passes through it. BUT, the flow decreases as the dirt collects. So, a K&N does filter better when it's dirty than it does when it's clean, but it flows the most air when it's clean.
Does that help?
Take care,
~Chris
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