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After market old stock high performance air cleaner this is the one with the drop bace the design is similar to the street hemi my buddy put one on his car and it pick up 3 tenths in the quarter mile this item is brand new never installed and was manufactured in or around 2000 . These fit Carter afb from 63 to 67 and maybe others the hole is about 4 1/4 or so $60 plus shipping.