Something interesting from K&N's Website for Flow Ratings:
FOAM: AMSOIL LT-31;UNIFILTER 04-0031 376 CFM
K&N (USED) (42,000 MILES) #E-1500 463CFM
PAPER AC A348C; FRAM CA326;HASTINGS AC-145; K-MART KA-12;MOTORCRAFT FA-71R
508 CFM
K&N FILTERCHARGER #E-1500 887 CFM
TEST NOTE #1: ALL AIR FILTER ELEMENTS WERE FLOW TESTED AT .3" H20 (WATER)
RESTRICTION AND THEN CONVERTED TO 11/2" H20 RESTRICTION BY USING THE SQUARE
LAW FORMULA.
TEST NOTE #2: ALL ELEMENTS TESTED WERE OF EQUAL SIZE (12" OD X 3 1/2" H)
AND WERE SPECIFIED BY THEIR RESPECTIVE MANUFACTURER FOR THE SAME APPLICATION.
I've requested a Flow Rating Data Sheet for their Cone Filters and 10" -
14" filters as well and will post this info as soon as I get it.
- Bernd
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