Napa 6637 Question
Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
Yeah, the older trucks (up to the early 99) needed the 120* bent extension. If you have a late 99 or newer, just a short piece of 3" ID PVC (which is 4" OD) will work, or a 3" long piece of 4" OD exhaust pipe will work as already mentioned...
EDIT: FWIW, you can fit the 6637 neck inside the end of the intake tube with a little work at it. I ran mine like that for a year before I switched to a short piece of exhaust pipe. You do have to watch it though -- it can loosen up over time...
EDIT: FWIW, you can fit the 6637 neck inside the end of the intake tube with a little work at it. I ran mine like that for a year before I switched to a short piece of exhaust pipe. You do have to watch it though -- it can loosen up over time...
Hotshot
Joined: Jul 2003
Posts: 12,177
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From: Newport, WA
If you go the ABS or PVC route you need to look for a 3" pipe coupler NOT 3.5" because it doesn't exist.
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Hotshot
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From: Rochdale MA
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Yeah, the older trucks (up to the early 99) needed the 120* bent extension. If you have a late 99 or newer, just a short piece of 3" ID PVC (which is 4" OD) will work, or a 3" long piece of 4" OD exhaust pipe will work as already mentioned...
EDIT: FWIW, you can fit the 6637 neck inside the end of the intake tube with a little work at it. I ran mine like that for a year before I switched to a short piece of exhaust pipe. You do have to watch it though -- it can loosen up over time...
EDIT: FWIW, you can fit the 6637 neck inside the end of the intake tube with a little work at it. I ran mine like that for a year before I switched to a short piece of exhaust pipe. You do have to watch it though -- it can loosen up over time...
Heres the thread
https://www.ford-trucks.com/forums/7...7-warning.html