Steve
Ive been deeply involved in filtration engineering for almost 30 years
..... this test is HOGWASH and marketing HYPE.
It purports unsupported claims vis a vis NO mention of the nature of
the test contaminent (usually AC FINE test dust ... an industry
standard). NO mention is made of the face velocity nor control of the
velocity of air flow, etc. etc.

The fact of the matter is that ALL these 'manufacturers' DO NOT make
the filter media (resinated technical paper) ... and there are only 3
technical paper mills supplying the WHOLE of this segement of the
automotive filter market .... so the question therefore is if
essentially 3 paper mills are make all the paper, then how come the
differences.
K&N is known poor technology, but the difference of the others ....
HYPE and marketing.



In article , Steven
Shelikoff wrote:

http://home.usadatanet.net/%7Ejbploc...011/SPICER.htm