Air Filter
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
If you use the 6637 filter you will need to remove the stock air box. The most important thing you need to know is "get rid the stock air box". They allow unfiltered air into the turbo, dusting the blades. There are a few aftermarket airbox/filter combos you can use but they are expensive. The 6637 aka 'kwik filter' is by far the cheapest.
Not needed
New User
Joined: Sep 2006
Posts: 21
Likes: 0
NAPA 6637 Mod for '97 psd 7.3
Sounded like a good cheap mod. Bought one yesterday with the following results...
1. The connection from the NAPA 6637 is the same size as the rubber connector connector to the turbo elbow. Even if you made the connection the filter would not be in a good location.
2. Taking off the stock air intake assembly is a pain in the ***. There are three mounting bolts. The first is easy, the second and third are rubber grommets with no logical removal method- short of breaking the assembly.
3. The intake on the 6637 is short and tapered. Not sure that a clamp would hold.
Short of a visit to the local furnace dealer for some oddball flex hose and figuring out a way to secure the filter once connected, I think the original is the better option.
Maybe I missed something- but not as easy as advertised.
1. The connection from the NAPA 6637 is the same size as the rubber connector connector to the turbo elbow. Even if you made the connection the filter would not be in a good location.
2. Taking off the stock air intake assembly is a pain in the ***. There are three mounting bolts. The first is easy, the second and third are rubber grommets with no logical removal method- short of breaking the assembly.
3. The intake on the 6637 is short and tapered. Not sure that a clamp would hold.
Short of a visit to the local furnace dealer for some oddball flex hose and figuring out a way to secure the filter once connected, I think the original is the better option.
Maybe I missed something- but not as easy as advertised.
