Quote:

The KN filter was originally invented in 1964 for SCCA weekend track racing by Ken Johnson and Norm McDonald,
where many were previously running without any air filter protecting the engine, and the oiled cotton gauze was a slightly better choice... the lesser of two evils.

http://findarticles.com/p/articles/mi_qa4078/is_200402/ai_n9350913/

Ken and Norm later sold out for a small fortune in the 1990s.

When totally new and clean,
but without excessive oil,
the KN may have about 2 to 3 inches of water restriction less,
but that it out of about atmosphere all around us total pressure of 404 inches of water pressure.

The Spicer web report previously posted above has good graphs showing this, but also shows how quickly the KN clogs up, and it lesser particle trapping efficiency.

For daily driving use
shouldn't the restriction of a filter be measured out at 5000 to 10000 miles?
Shouldn't you be more interested in the 'real world' restriction during most of the time your engine is 'feeling it' and not just when new?



Thanks for the info. Great article, great information!

Fortunately for K&N, people still love and use them despite the increasing mountain of data against them.

But hey! Cutting edge 1960s air filter technology on your 1960s Mopar, why not!?!