AFE Stage 2 vs 6637 - Ford Powerstroke Diesel Forum
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Old 09-05-2013, 06:27 AM
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AFE Stage 2 vs 6637

When I bought my truck 2 years ago it came with the AFE Stage 2 setup. Have been looking at the 6637 due to the simple nature of it, but not really sure this makes sense. Do you know if the 6637 flows more air being open to the engine bay versus the Stage 2 having the enclosure around it. I have heard about the ZooDad mod to bring more air in, but just want to put this thought to rest.

Thanks in advance....
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Old 09-05-2013, 06:41 AM
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The 6637 is a bigger filter, it has more surface area than most filter so it can allow more air to flow through it.
Which AFE set up do you have? the one which the battery box or not?

If you have the one with the battery box, do the zoodad mod will allow more cool air flow into the sealed box. Also try to find a bigger filter that can fit and that will help.
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Old 09-05-2013, 06:58 AM
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It is the closed one with the battery box.
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Old 09-05-2013, 07:01 AM
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The larger surface area doesn't necessarily mean more air flow. I haven't seen any tests conducted, but with AFE being an oil type filter (though I understand better than K&N), it allows for it to likely have larger pores, thereby restricting less. The size difference may put them at equal airflow rates.

I prefer the 6637 simply because it filters better, and has plenty of airflow.
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Old 09-05-2013, 07:04 AM
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So you have this one?



they have both dry and oil filters for these.

Personally I would keep this set up.


If you do want to go to 6637, I will trade you. I just put my 6637 on my truck like last week.
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Old 09-05-2013, 10:01 AM
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That's the one. I think I will plan to keep it. Thank you for the quick responses and now I can bug you guys with other thoughts.....
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Old 09-05-2013, 11:01 AM
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I used too run a 6637 filter setup on my truck and actually switched to a AFE Filter on my intake. The size is similar ( AFE slightly larger ) and the flow with the AFE is much more than an paper 6637 and is a clean able filter.
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