finally
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Joined: Mar 2010
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finally
well all my necessary repairs are completed so i ordered my diamond eye 4 inch turbo back kit finally.now in a couple of weeks i plan on getting a 6637 kit.
is everybody happy with the 6637 kit?
is everybody happy with the 6637 kit?
Logistics Pro
Joined: Dec 2010
Posts: 4,738
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From: Temperance, MI
Thats what most everyone runs here and they including myself are very happy with it. There are a few complaints from some guys but the bennifits out weigh them hands down. Some say its a little loud but who really cares
Hotshot
Joined: Jan 2011
Posts: 18,849
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From: Puget Sound
My truck came with the Ford AIS when I bought it - I never heard the turbo until I changed the exhaust. I rode in a truck with the 6637 and I asked what that "whining" was in the front... just before I realized this was the 6637 whine I'd been hearing about on the forum. It's a taste thing, but I find whining annoying... ever since I had that traumatic ordeal of raising three children.
Hotshot
Joined: May 2005
Posts: 13,484
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From: Stevens Point, WI
My buddy had a K&N on his truck and it whistled and whined from under the hood all the time. Even he mentioned it gets annoying especially on long trips.
I am an all stock kind of guy. I will do some things to improve reliability and longevity but not at the sacrifice of annoying. lol
I am an all stock kind of guy. I will do some things to improve reliability and longevity but not at the sacrifice of annoying. lol
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Joined: May 2007
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I had the 6637 for a number of years and it was great, but like others have mentioned the swishing/swooshing can get old. Went with an S&B and it is much tamer and I can't tell any performance difference at all. Yeah it was more expensive but I got the performance and manners I was looking for finally.
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Logistics Pro
Joined: Dec 2010
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From: Temperance, MI
You can also make a air box for it. I dont think it does anything but make under the hood look a lot cleaner, heres a pic of mine
Before install
Box
Installed
The prints for the box are floating around the forum Im sure someone has them handy, I dont at the minuite
Before install
Box
Installed
The prints for the box are floating around the forum Im sure someone has them handy, I dont at the minuite
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Joined: Jun 2012
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Hotshot
Joined: May 2005
Posts: 13,484
Likes: 42
From: Stevens Point, WI
Here's the info on the box: https://www.ford-trucks.com/forums/1...-question.html
Where did the battery go?
Senior User
Joined: Jun 2012
Posts: 133
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Here's some better links: T
his one has the plans you can print off: https://www.ford-trucks.com/forums/71...ml#post5937371
This one has pics of the guy doing it and it will show you where the battery went: https://www.ford-trucks.com/forums/98...enclosure.html
Anyone just tried to modify the stock air box for the same thing?
his one has the plans you can print off: https://www.ford-trucks.com/forums/71...ml#post5937371
This one has pics of the guy doing it and it will show you where the battery went: https://www.ford-trucks.com/forums/98...enclosure.html
Anyone just tried to modify the stock air box for the same thing?
Posting Guru
Joined: May 2006
Posts: 1,427
Likes: 1
From: Bryson City NC
I just put the 6637 on BigRed and I am kinda disappointed !
When I put a fresh air on my F250 not a 6637 I had a nice mellow turbo whine when I hit it! 
Now I really don't hear anything diff than the stock air filter !! 
But I am not disappointed in how she runs!! Like a scalded dog!!
But I did like to her that turbo spool up !
Smokie
When I put a fresh air on my F250 not a 6637 I had a nice mellow turbo whine when I hit it! Now I really don't hear anything diff than the stock air filter !! But I am not disappointed in how she runs!! Like a scalded dog!! But I did like to her that turbo spool up !Smokie
Senior User
Joined: Jun 2012
Posts: 133
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I got my 6637 today and installed it on my lunch break. Didnt have enough time to drive it. I left part of the original air box in... anyone else done this? Its just the bottom portion of the air inlet tube. You can see it in the bottom left part of the picture. 
Last edited by ralleyclimber; Jul 16, 2012 at 03:17 PM. Reason: fix pic url