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I think AFE stands out from the rest. And as far as the stock filter goes it may not be that restrictive, but it is more so than a good cold air intake like AFE, and yes there is a littel difference in performance even under 500 hp. Probably not that much, but I think it is worth it. When I changed the exhaust and put a cold air intake on my truck I saw a 2mpg increase. Just my 2 cents.
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Ford f350 6.0 4x4. 4" silverline turbo back, cold air intake, six speed manual tranny, sct x3.
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