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Stay away from the spacer they are useless. I have a k&n cai on my truck now for over 3 years and 100,000 k or more with zero issues or problems. Never had a problem with the oil on the maf. Just don't go over board with the oil. It only takes a little bit
True that^ Also, I let mine dry out in the sun for 4-6 hours like I do with my dirtbike filters. Just doesn't make sense to oil one up and wait only 20 minutes...