Not Ranked
Sure they can, I have been using K&N for years and I have absolutely no leakage or blow by. I use the rubber push in type on my drivers side valve cover and a rubber gasket with a PCV valve in the passenger side hooked up to the intake. I also have the breather on the back of my intake that helps a lot too.
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Clois
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Sunshine, Asphalt and no stop signs...Perfect
"Let's roll"
"Be part of Something Good
......Leave Something Good Behind!"
from CD "Long Road Out of Eden"
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