Which air filter
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Elder User
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Which air filter
I am trying to decide which filter I should go with 6637,AIS,or AFE. I have 02 F-450 and there will be times where I will be driving in some dusty conditions. I hear alot of good things about the 6637. How will it do in dusty conditions compared to the other two filters? Which filter flows the best and how do they sound compared to each other? I also plan on doing my exhaust, does any one know the difference between turbo back and straight pipe? Is there a difference in performance or just the sound? I would also like my truck to sound good. I plan to go with MBRP. Any one out there have these set ups or have had experience with it? Any help would be grately appreciated.
Elder User
Joined: Sep 2006
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From: Middleton, Idaho
All three of your air filter choices are excellent. All will filter and flow air in the most extreme conditions. Start with the 6637, cheapest, If you like the sound of the turbo keep it if not go too one of your other choices. " Turboback " refers to starting your exhaust at the back of the turbo. Cat back refers to starting your new system at the back of your Catalytic converter. ALL will chime in with their prefences mine is in my sig.
Hotshot
Joined: Nov 2006
Posts: 11,286
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From: North of Greenville
Here's my experience with the 6637, though not in excessively dusty conditions. I got excellent filtration, but am also running my own homemade prefilter cover, which certainly gets nasty from road dirt and helps extend the filter life. I had to replace my filter after about 17K miles due to declining mileage. Sound is great. You can hear the turbo whistle as it spools up above 2000 RPM, and there's a nice whoosh sound when it shifts into higher gears and when I get off the pedal to stop.
From what I've read, the AIS is the cat's meow in terms of filtration efficiency, but is also the most expensive of the three. Sound is much, MUCH less than with the 6637 due to the closed box design. If you tow and have the potential for any drone, the 6637 may provide too much sound for you, which is what Kwik experienced before he converted over to the AIS on his F450.
Lots of folks in here use the AFE, and I have no reason to doubt their quality or performance, but they are simply much more expensive than the 6637.
I don't know if you'll notice any appreciable power differences between the three... al are excellent choices for air flow, filtration efficiency, and overall engine performance and protection.
Can't really speak to the exhaust... haven't done mine yet.
From what I've read, the AIS is the cat's meow in terms of filtration efficiency, but is also the most expensive of the three. Sound is much, MUCH less than with the 6637 due to the closed box design. If you tow and have the potential for any drone, the 6637 may provide too much sound for you, which is what Kwik experienced before he converted over to the AIS on his F450.
Lots of folks in here use the AFE, and I have no reason to doubt their quality or performance, but they are simply much more expensive than the 6637.
I don't know if you'll notice any appreciable power differences between the three... al are excellent choices for air flow, filtration efficiency, and overall engine performance and protection.
Can't really speak to the exhaust... haven't done mine yet.
Logistics Pro
Joined: Jun 2005
Posts: 4,243
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From: AZ
Well, I think you will find the consensus here is the following:
for value: 6637
for filtration: AIS
for flow: probably AFE > 6637 or AIS
The single most important thing to your truck is to get clean air (just hold your hand by the intake tube at idle to get a feel for how much air a diesel ingests)...the AIS is the filter for best filtration in dusty conditions. I drive in the worst possible dust conditions all the time and the AIS gives me absolutely spotless intake tube and turbo. Unless you are going to build a big horsepower engine, I don't think you need to be concerned with any of the three choices for air flow. You would easily get 30-40K out of the AIS filter element in extreme dusty conditions (which offsets the high cost of the element - I just tap it out every couple a thousand miles). The 6637 allows more turbo "noise" and some have said that when pulling a load it can get bothersome...a drone sound. The AIS is extremely quiet, which I like because I can then listen to my books on cd without having to turn the sound way up in volume. Hope this helps you.
for value: 6637
for filtration: AIS
for flow: probably AFE > 6637 or AIS
The single most important thing to your truck is to get clean air (just hold your hand by the intake tube at idle to get a feel for how much air a diesel ingests)...the AIS is the filter for best filtration in dusty conditions. I drive in the worst possible dust conditions all the time and the AIS gives me absolutely spotless intake tube and turbo. Unless you are going to build a big horsepower engine, I don't think you need to be concerned with any of the three choices for air flow. You would easily get 30-40K out of the AIS filter element in extreme dusty conditions (which offsets the high cost of the element - I just tap it out every couple a thousand miles). The 6637 allows more turbo "noise" and some have said that when pulling a load it can get bothersome...a drone sound. The AIS is extremely quiet, which I like because I can then listen to my books on cd without having to turn the sound way up in volume. Hope this helps you.
Postmaster
Joined: Jun 2006
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From: Fulltime RVer
Originally Posted by homesteader
I am trying to decide which filter I should go with 6637,AIS,or AFE. I have 02 F-450 and there will be times where I will be driving in some dusty conditions. I hear alot of good things about the 6637. How will it do in dusty conditions compared to the other two filters? Which filter flows the best and how do they sound compared to each other? I also plan on doing my exhaust, does any one know the difference between turbo back and straight pipe? Is there a difference in performance or just the sound? I would also like my truck to sound good. I plan to go with MBRP. Any one out there have these set ups or have had experience with it? Any help would be grately appreciated.
1) https://www.ford-trucks.com/forums/667974-when-is-the-6637-too-dirty.html
2) https://www.ford-trucks.com/forums/515868-ais-severe-duty-filter.html
3) https://www.ford-trucks.com/forums/660609-analysis-of-tenns-6637-restriction-data.html
4) https://www.ford-trucks.com/forums/649324-intake-cfm-shootout.html
5) https://www.ford-trucks.com/forums/649731-air-filter-data-please-post-yours-here.html
6) https://www.ford-trucks.com/forums/648181-my-rambling-contribution-to-tenns-cfm-measurement-project-part-1-of-2-a.html#post5084729
7) https://www.ford-trucks.com/forums/645913-intake.html
8) https://www.ford-trucks.com/forums/645117-getting-ready-to-do-some-6637-testing.html
9) https://www.ford-trucks.com/forums/641190-new-air-filter-system.html
10) https://www.ford-trucks.com/forums/636009-kwik-mod-damage-turbo.html
11) https://www.ford-trucks.com/forums/636400-the-zoodad-mod.html
12) https://www.ford-trucks.com/forums/642354-my-zoodad-gave-birth-to-a-genedad-comments-welcomed.html
13) https://www.ford-trucks.com/forums/652772-the-genedad-2-appears-to-be-a-success.html
14) https://www.ford-trucks.com/forums/651460-whosyergenedadramair-mod.html
While the #14 thread might be the most entertaining to read, it has the least amount of useful technical data to help with your choice of filters. For example, thread #5 has...
Originally Posted by ernesteugene
... It should be noted that CFM vs Restriction is not the complete story, and in most cases isn't even the most important parameter to consider when selecting an air filter. I've seen air filter specifications ranging from 99.5% to 99.99% capture efficiency. This can make a big difference in the # grams of dust per 1000 miles that goes through your engine. One of these days I'm going to do an analysis of this, and try to estimate how much dust flows through a typical engine, and how much it takes before showing up on an oil analysis report.
This graph is based on data for brand new clean filters. As these filters begin to collect dirt, their CFM curves will move to the right so that a given CFM will result in higher restriction. Typically, a good filter minder will indicate it's time for a new element at a restriction of about 20" H20. Taking the AIS as an example, at 500 CFM it can collect and hold about 1300 grams of dirt as its restriction doubles from about 10" to 20" H20.
Filters like K&N, etc... might look attractive because of their low initial restriction when clean, but they can't hold very much dirt, and for that matter capture it very well to begin with! As soon as these filters get a dirt load of even 10 to 20 grams, their restriction rapidly increases to more than that of a plain paper filter. I've seen many references stating that both MPG and dyno HP are independent of restriction, as long as the restriction is less than about 20" H20 or so...
This graph is based on data for brand new clean filters. As these filters begin to collect dirt, their CFM curves will move to the right so that a given CFM will result in higher restriction. Typically, a good filter minder will indicate it's time for a new element at a restriction of about 20" H20. Taking the AIS as an example, at 500 CFM it can collect and hold about 1300 grams of dirt as its restriction doubles from about 10" to 20" H20.
Filters like K&N, etc... might look attractive because of their low initial restriction when clean, but they can't hold very much dirt, and for that matter capture it very well to begin with! As soon as these filters get a dirt load of even 10 to 20 grams, their restriction rapidly increases to more than that of a plain paper filter. I've seen many references stating that both MPG and dyno HP are independent of restriction, as long as the restriction is less than about 20" H20 or so...
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Elder User
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Thanks guys. I think I would start with 6637 first and see how that works out for me. Do I have to use SS pipe to do the ccv and the short piece between the tube and the filter? My truck will have a lot of weight its a mechanic truck so I will see how the noise will be from the insde. Does any one out there could give some info on the exhaust side? If I go with a straight pipe will I still have enough back pressure? Any info woul dbe greatly appreciated
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Elder User
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From: Middleton, Idaho
Originally Posted by homesteader
Thanks guys. I think I would start with 6637 first and see how that works out for me. Do I have to use SS pipe to do the ccv and the short piece between the tube and the filter? My truck will have a lot of weight its a mechanic truck so I will see how the noise will be from the insde. Does any one out there could give some info on the exhaust side? If I go with a straight pipe will I still have enough back pressure? Any info woul dbe greatly appreciated
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Thread Starter
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Elder User
Joined: Sep 2007
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OK IDPisan how much louder will it be staight piped than stock exhuast? I dont want it to sound annoying loud. I just like to have that nice tone. Which is the best exhaust for our trucks? Or how will it sound with the 6637?
Gone, but not forgotten
Joined: Oct 2005
Posts: 5,026
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From: Charlotte-Fairbanks-Bflo
I really like my 6637 and 4" turbo back SS with no muffler. I am amazed by the number of other PSD owners that approach me just to ask me what in the Hell I have done to get my truck to sound so cool.
Elder User
Joined: Sep 2006
Posts: 627
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From: Middleton, Idaho
Here is a link provided by quikordead on the sounds your truck can make
http://home.comcast.net/~kwikkordead/index.html
I got my exhaust system from Mark @ MKO
http://mkopower.com/index.cfm?pv=hm
It is louder, some guys like it some don't. I LIKE IT!!!
http://home.comcast.net/~kwikkordead/index.html
I got my exhaust system from Mark @ MKO
http://mkopower.com/index.cfm?pv=hm
It is louder, some guys like it some don't. I LIKE IT!!!
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Elder User
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Markadeck do you mind me asking what brand of exhaust system you have on your truck? When you order your exhaust kit do they sell a sraight pipe kit with out the muffler? I have 02 450 dually do think a staight pipe kit will fit my truck? I also wanted to run dual pipes. THANKS
Postmaster
Joined: Jun 2006
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From: Fulltime RVer
Originally Posted by IDPisan
Here is a link provided by quikordead on the sounds your truck can make
Originally Posted by Kwikkordead
Yeah, I have the AIS now and will never go back. I got sick of the intake drone.