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Message: <blockquote data-quote="Mustang5L5" data-source="post: 1550893" data-attributes="member: 30520">I design filters for a living. I think some of you are overthinking this but generally speaking there are trade-offs in the filter world when it comes to filtering gas.   If you want good flow, you tend to sacrifice particle retention (the ability to actually filter).  If you want a filter to actually trap particles, flow tends to be poor. Most testing usually shows that K&N type filters will flow the best, but don' trap particle as well.  K&N tries to help the filter by adding oil, but it can only do so much. Another method of increasing flow through a filter is by adding filter membrane surface area, in other words a big ass filter.   A big honking conical in the bay will certainly draw a lot of air, but then you run into other issues with heat from the engine and fan wash and such.  Nobody has made the perfect air filter yet so you really need to decide do you want flow, or do you want the filter to actually filter. On my H/C/I  302 Fox, i run a stock airbox tube with a K&N filter, as I mainly drive that car on sunny days on clean, well-maintained roads.    On my daily driver '00 GT, i run a stock Ford motorcraft filter because I've driven it down dusty roads and other roads where there is crap i'd rather keep out of my engine.</blockquote>