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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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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