"Substantially superior", not sure it said that either, but superior yes.
From 'Bob is the oil guy' site:
Filtration test:
A color comparison is used to determine real world filtration ability. Each test filter was used in the same car, on the same roads for 500 miles. The darker deposits indicate poorer filtration, and lighter ones better filtration. That said, both the cotton gauze type (K&N) and foam filters (Amsoil & Jackson Racing) showed the same levels of filtration. Both performed poorly compared to the fiberous or paper filters (Napa, Baldwin, and Mazda).
In the end, paper or fiberous filters do remove more particles from the air before they enter your engine. The cotton gauze filters indeed offer better airflow. You have to decide for yourself whether you value ever last ounce of power or filtration.
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2002 Inferno Red PT Limited
Photos and more at: http://www.randgraphics.org/PT_Cruiser/demos/index.htm
Mercedes Wiki
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