Check this out>>> posted by Spongerider (Soon) on August 22, 2002 at 05:58 PM
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K&N Filters are suppose to have the K&N oil on them to work properly...In tests done by K&N they found that there filters flow more air as well as trap more dirt with the oil. If you look at the test done the Filter elements in the test look dry, (no oil) this could easily destort the results in the test.
HKS filter let sand go right through into your engine. If you take an HKS filter off and tap the clean side on a clean surface you will be amazed how much sand and dirt falls right through the filter.