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In all my years, I've never had a problem with the AC filters.
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I'm not real crazy about the newer AC filters (made by Champion Labs)...compare 'em to the old ones...the new ones have 8 smaller holes in the top versus 6 larger holes in the older filters...the bad part is they replaced the sturdy steel guts with flimsy material...you fellow racers that cut open your oil filters probably noticed this already.
check 'em out