Napa 6637 Question

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Oct 28, 2008 | 12:49 PM

PAVEMENTMAN

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Napa 6637 Question

Anybody Know The Part Number Of The Napa Tube Used For The 6637 Filter That Goes From The Filter To The Intake Tube.

Oct 28, 2008 | 12:53 PM

liftedgrocerygetter

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From: Gilbert, Az

I don't know the part number for Napa or if they have one but you can use a 4" piece of ABS or exhast pipe.

Oct 28, 2008 | 12:53 PM

megawatt00

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From: Rochdale MA

It is just a peice of 4" exhaust tubing,or a 3.5" (4" OD) pvc fitting.

Oct 28, 2008 | 12:55 PM

PAVEMENTMAN

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Ok I Have A 96 That I Did This To And It Had A Napa Part Number For The Tube Because It Has To Have The Right Bend To It.

Oct 28, 2008 | 12:58 PM

Izzy351

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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...

Oct 28, 2008 | 01:02 PM

megawatt00

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From: Rochdale MA

If you need a bent peice, go to an electrical supply house and get a 3.5" EMT 45* elbow, this has a OD of 4". You can mark and cut it to what you need.

Oct 28, 2008 | 01:04 PM

superduty4x4

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From: Newport, WA

Quote:

Originally Posted by megawatt00

It is just a peice of 4" exhaust tubing,or a 3.5" (4" OD) pvc fitting.

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.

Oct 28, 2008 | 01:31 PM

PwerStroke99

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From: Montana

or just call Tymar PErformance and get his complete intake, well worth the money. his replacement filters are about $23 IIRC

Oct 28, 2008 | 02:40 PM

#10

Ponyboychris

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From: Kiowa CO

Or look here for some other options:

Exhaust Elbows

Exhaust Tubing

Oct 28, 2008 | 03:34 PM

#11

PwerStroke99

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From: Montana

Quote:

Originally Posted by Ponyboychris

Or look here for some other options:

Exhaust Elbows

Exhaust Tubing

those are good choices too

Oct 28, 2008 | 03:56 PM

#12

deereman4020

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From: horicon Wi

The napa part number for the 6637 is FIL6637. Get on the 6637 quick because Napa is having a sale on airfilters.

Oct 28, 2008 | 04:17 PM

#13

4inchlovin

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Quote:

Originally Posted by Izzy351

Someone had made a thread warning about soing it that way. they said that they found it was pinching the bottom of the filter and cause a passage for air...
Heres the thread
https://www.ford-trucks.com/forums/7...7-warning.html