K&N Air Filters

I have used them since 1981. Performance wise there is not any difference that I can tell. Although, I have a 2800CS which I understand is somewhat restricted by the air intake ducting. Might be able to hear the intake more. I like being able to run 50,000 miles between cleaning. I can be rather lazy sometimes.
 
the gist of what I read here and elsewhere is that they flow nicely for a car that does have some stock intake restriction, but they pass a lot of fine dust.
 
I also hear a lot that they pass a lot of fine dust . I also use K&N filters on my off-road vehicles and have put a lot of miles on them. One truck that I put almost 200K miles on, before I sold to a co-worker, had many oil lab analysis done on it during the time it had K&N filters. Intake of fine dust would show up as a high percentage silicon contaminant. The Si content was always normal even when I did a lot of off-road activity.

That vehicle also did not use any more oil at nearly 200K miles (about 1 qt./5000 miles) than it did any time in its life including new. It also severed towing duty pulling my race car all over the country. If it was passing fine dust, it sure didn't harm the engine. It is still running with close to 300K miles on it and the only thing done to the engine other than normal maintenance items was replacement of the valve cover gaskets.

My current off-road truck has 180K miles on it and it has also had a K&N filter since the first filter change. I plan to keep it for at least 300K miles and so far it is looking like it will make it without any major repairs needed to the engine.

This is not intended to be a commercial for K&N. It just amazes me when people bad mouth a product without real world experience with it or use it improperly. Honolulu, this is not a dagger directed toward you either.
 
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