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I can't remember what the 6637 flows but depending on your mods and where you want to go, total CFM won't be the deciding factor. IMHO I would choose between the 6637 and the S&B since it filters better than the AFE and is less expensive.
thanx ill be ordering one soon clay i was looking at Platinum petes pictures hes building a cold air box for his looks like a great idea
I can't take credit for the airbox, I copied it from Chris (F350-6). Here is a link to the thread, post 72 has the links to the pdf files with the demensions/layout. https://www.ford-trucks.com/forums/7...ml#post5937371