Well after my mishap with posting in the wrong area the first time about vendors I guess i'll throw this here. I just bought the high flow air cleaner from Zippers and went to install it on Saturday,I followed the instructions to the letter put the washer supplied on the back of the cover and went to tighten up the cover to the air cleaner and as I tightened the cover just fell off to the floor.I then discovered the center of the filter pulled out leaving a hole in the air filter and no way to attach the cover. So being the inventive wrench that I am I took the old filter and used the cutting attachment on my dremel,cut the center bolt section out of my stock filter ,cleaned it up and epoxied it to the gaping hole in the Zippers filter.Let it set up added an extra washer to the back of the cover and tightened up again.SUCCESS!I don't know if it was installer error or manufacturing error but this is a little FYI for the rest of you. Later,Q