AFE Stage 2 vs 6637 - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 09-05-2013, 06:27 AM Thread Starter
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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....

2002 F250 CC SB 4x4 7.3L
165K Miles
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PHP Hydra
RiffRaff FRx
AFE Stage 2
Wicked Wheel 2
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post #2 of 7 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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post #3 of 7 Old 09-05-2013, 06:58 AM Thread Starter
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It is the closed one with the battery box.

2002 F250 CC SB 4x4 7.3L
165K Miles
CCV Mod
Fluidampr
PHP Hydra
RiffRaff FRx
AFE Stage 2
Wicked Wheel 2
Adrenaline HPOP
Evans NPG Coolant
Aeroforce Interceptor
Mishimoto Intercooler
6.0 Transmission Cooler
Red Head Steering Gear
4" Turbo Back Magnaflow
International Bellowed Up-Pipes
Dieselsite Legendary Transmission

2 Corinthians 5:15 - "and He died for all, so that they who live might no longer live for themselves, but for Him who died and rose again on their behalf"
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post #4 of 7 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.

2002 F250 CCSB 4x4
PHP Phoenix, John Woods VB, NUC bypass, 6637

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post #5 of 7 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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post #6 of 7 Old 09-05-2013, 10:01 AM Thread Starter
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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.....

2002 F250 CC SB 4x4 7.3L
165K Miles
CCV Mod
Fluidampr
PHP Hydra
RiffRaff FRx
AFE Stage 2
Wicked Wheel 2
Adrenaline HPOP
Evans NPG Coolant
Aeroforce Interceptor
Mishimoto Intercooler
6.0 Transmission Cooler
Red Head Steering Gear
4" Turbo Back Magnaflow
International Bellowed Up-Pipes
Dieselsite Legendary Transmission

2 Corinthians 5:15 - "and He died for all, so that they who live might no longer live for themselves, but for Him who died and rose again on their behalf"
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post #7 of 7 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.

Bryan At Alligator
http://www.alligatorperformance.com/

1995 F-250 5spd, 250/100s, T-500 HPOP Colt Stg. 2 cam, Irate Comp E-Fuel, WOP Head Studs, 3in Billet RiffRaff Plenums, Irate T4 Pedestal, S366, 99+ Intercooler, SBC Clutch, 4in Diamond Eye Duals
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