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*
Swamps IDM Mod