Back in 01 or 02, a guy on thedeiselstop.com teamed up with Gail Banks to test 10 top filters for CFM on the 7.3PSD. K&N was one of them.
The test results showed the the stock Motorcraft pleated filer, FA1750, out preform all the filters tested for CFM at approx 850cfm if I remember correct.
K&N came in 4th from the bottom for CFM.
K&N also has a known gasket leak as it doesn't fit the stock air box very well. K&N supposed fixed this in 2004 but they still found leaks after that time.
There was another test preformed by the DMax group. Once again K&N finished near the bottom in both CFM and particulates.
It's pretty hard to beat a pleated air filter. Many have tried but most have failed.
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