K & N filters

What's really funny here is that outboard boat motors for years have never had a air filter but yet they can still run good after years of service and the boat motor makers have no problems with warranties, Mercury even offers 5 year warranty and no air filter.

So with that said how can K&N do so much damage as many here claim but a boat motor with no air filter be fine year after year, and please don't say no dust on lakes, here in Nevada there is dust everywhere, even at Lake Mead..

:C