Per K&N*
"That brings us to size.
Use the formula below to compute the minimum size filter required for your particular application. The usable portion of the filter is called the EFFECTIVE FILTERING AREA which is determined by multiplying the diameter of the filter times Pi (3.1416) times the height of the air filter in inches, then subtracting
.75-inch. We subtract .75-inch to compensate for the rubber seals on each end of the element and the filter material near them since very little air flows through this area.
A = effective filtering area
CID = cubic inch displacement
RPM = revolutions per minute at maximum power
Example: A 281 CID Ford engine with a horsepower peak at 6,500 rpm.
281CI X 6,500RPM / 20,839 = 87.65
If you are sizing a panel filter, multiply the width of the filter area (not the rubber seal) times its length."
The panel filter would need to be 9.4"X9.4".
The filter I have is 127.25" in Effective Filtering Area.
*Note: changed to reflect MM application.
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