There is no performance advantage to dual filters. There's a post somewhere in the archives about this, by the Master Himself (Roland).
http://forums.pelicanparts.com/showthread.php?threadid=74213&highlight=mfi+air+intake
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'66 911 #304065 Irischgruen
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Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13)
Ex-'88 Carrera (Sold 3/29/02)
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