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From the hard data I've seen, there is minimal restriction in the bone stock intake and any and all modifications and replacements seem to produce minimal results unless many other engine modifications (headers, exhaust, chip, etc) are also done.
My opinion of best is the stock enclosure with high quality paper (I use Napa Gold) filter changed regularly.
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'99 F250 V10 Super Cab Long Bed 4x4. '06 short block, PI conversion, modded airbox, 5 Star custom tune, 315/75-16's, 4.30 LSD.
Why, yes, I am some kind of a geek engineer. Thank you for asking.
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