Headed down the Dark Path ...
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Senior User
Joined: May 2007
Posts: 159
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From: Michigan
Headed down the Dark Path ...
I want to thank all of you for all the information contained in this forum ... and curse you as well ... I performed my first mod ... 6637 ... My wife said I had a grin on my face all day and she couldn't figue out why .... I just purchased my first Ex this spring, 02 7.3L 4" w/33's and I have never been happier about a vehicle ... but I think you all know that already .... 
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Senior User
Joined: May 2007
Posts: 159
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From: Michigan
Originally Posted by Ranger1F150
Whats a 6637 mod ?
Last edited by Roody727; Jul 24, 2007 at 12:10 PM.
Master of Strokes
Joined: Mar 2007
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From: CA
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Elder User
Joined: Dec 2005
Posts: 520
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From: Marietta, GA
Roody congrats on your new found addiction that we all share. I would be a little concerned about the hot air but if you do the ZooDad mod if would help tremendously, it will only take 1/2 an hour or so and it's free. search for a how-to, if you can't find it myself or one of the other guys can explain
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Senior User
Joined: May 2007
Posts: 159
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From: Michigan
Originally Posted by XHunter
Roody congrats on your new found addiction that we all share. I would be a little concerned about the hot air but if you do the ZooDad mod if would help tremendously, it will only take 1/2 an hour or so and it's free. search for a how-to, if you can't find it myself or one of the other guys can explain
Posting Guru
Joined: Dec 2006
Posts: 2,498
Likes: 3
From: Windsor, Colorado
I have the 6637 mod on my f350 and have a filter sitting in my garage for the excursion I just acquired. It is a great mod. The hot air is myth in my opinion I dont see how it is much if any hotter than the factory air box. Unless maybe your idling all day long, but then that shouldnt matter anyway. I showed it to the diesel tech at our local dealership and he liked it enough to put one on his personal pickup. The factory air box is junk!!
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
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From: Washington State
Originally Posted by Roody727
Removing the stock air box and filter and replacing it with a Napa #6637 air filter ...
