The AFE is 4.124" in diameter, according to my calculations this makes it a 84.5 of the OEM diameter or a 15.5% reduction if my calculations are correct.
Dave
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2020 Ford Mustang GT 6MT PP1 444rwhp
(Sold)2013 M3 Coupe-MR/BLK ZCP, 2011 M3 Coupe-MR/Blk
2007 Porsche 997C2S Speed Yellow/Blk sport seats
2004 BMW M3 Imola/Blk
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