6637 Mod on Early 99 - Ford Powerstroke Diesel Forum
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  #1  
Old 11-13-2006, 07:13 PM
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6637 Mod on Early 99

I just did the 6637 Mod on an otherwise stock early 99, except for FPR shim. Woo Hoo!! I can really feel the difference. I used a 3" long piece of 4" exhaust pipe, and half of a rubber 4" plumbing repair elbow. I cut it so I ended up with 2 45 degree elbows. I slipped the 4" pipe into the cut end, and clamped, and the large end, made to slip over 4" black iron pipe fit the snout of the 6637 perfectly. This left it exactly the right length to match up to the OEM tubing to the turbo. I think it looks good. I got the elbow at the Menards. Any home improvement center should have them - about $13.00 + $20.00 for the filter from Fleet Filter, and $1.00 for the short piece of exhaust pipe. I Like!:burnout
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Old 11-13-2006, 07:32 PM
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Very Cool! Those things really flow some air don't they!
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Old 12-06-2006, 05:56 AM
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6637 Mod

What exactly is it ?
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Old 12-06-2006, 06:00 AM
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Quote:
Originally Posted by Cope99 View Post
What exactly is it ?
commonly called the big honkin air filter or they tymar air filter mod....6637 is the filter number at napa....
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Old 12-10-2006, 05:32 AM
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6637 Mod

Thanks I wasnt sure.
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Old 12-10-2006, 11:59 AM
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DIY Intake
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  #7  
Old 12-10-2006, 09:33 PM
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I also just did mine and I'm very satisfied but does the turbo swooooosh sound after I let off hurt anything
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