So I posted this same question on powerstroke.org but have not gotten anyone with experance on both systems. But the real question is that I have been thinking of upgrading the intake next and was planning on going with the Banks system but I have seen some people talking about the Ford Severe Duty AIS. So what are your thoughts, first thing I see in the big price difference. But I really like the nice clean setup banks offers as well. How well does each one really flow and filter? Here are links to both. Thanks

Banks Banks Power Gale Banks Engineering 42210 - Banks Ram-Air Intake Systems - Overview - SummitRacing.com

Severe Duty AIS MOTORCRAFT Part # FA1759

 

I can only comment on the AIS, as I have one. I've been very happy with it-

I only drive the truck about 5k miles a year, and I change the filter every other year. It does not look very dirty, but I change it anyway. I even did the fender sleeve option, and its still pretty clean.

My EOA's always come back really good too.

It's a direct drop in replacement for the stock air box.

It seems to flow plenty of air for what I need now and in the future.
If you're going really hard core, one of the 6637's may be better.

Sorry, no info on the other intake/filter you mentioned.