Quote Originally Posted by oj88 View Post
^ True, the tests were done in a controlled fashion and followed proper test procedures and standards.

And I also agree with the test results, which makes sense for any filter media that is coated with oil, that the K&N filter does provide more airflow at the BEGINNING but drastically tapers off and becomes more restrictive compared to a paper filter as dirt is exponentially accumulated. What this is telling us is that K&N filters may be ideal in motorsports where peak airflow is required only for the duration of the competition. However, I'd never recommend it for daily city use where the environmental air quality is considered extreme.

And those filter wraps were meant to be put on TEMPORARILY to repell water splashes or as an additional layer when driving in extremely dusty environments (think Dakar, rallycross, 4x4 off-roading without a snorkel, etc.) Again, it's probably NOT ideal for daily use.
Test results made on your own mind is called IMAGINATION not Science. MAF Theory BUSTED! Motorcraft(R) Air Filters – The Official Ford Parts Site

Wanna bet? 3:1 wager

Paper Cabin & Air Filter are ideal for daily use?


This propaganda was created to scare people from trying.

Applicable only for Air intake Systems purchased and installed in the U.S.A.
K&N intake system offers an UNCONDITIONAL 30 day MONEY BACK GUARANTEE. If you are unhappy with a K&N intake system for ANY REASON, including the horsepower improvement experienced, we will refund 100% of the purchase price and even pay for return shipping to K&N.