Napa 6637 or Donaldson B085011 - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 1 (permalink) Old 03-24-2009, 12:51 PM Thread Starter
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Napa 6637 or Donaldson B085011

Does anybody know which is the best of these two filters? Is the Donaldson made with a better media more water resistant etc>?
The Donaldson is also 1.38" shorter which would help in my cold air box.
The Donaldson claims to flow 470 cfm and the Napa 425 CFM. I don't know where they come up with that but is sure enough in the specs I was just reading.
According to Dale the Napa 6637 is junk .

'97 F-350 4-WD
E4OD 3.55 gears
7.3 I-C stage 1's
Termy modded 17*
Tru-Cool 4739
Swamps IDM Mod
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