I currently have a homemade air intake I have used a K&N air filter with. My Question is which filter flows more air the K&N or the NAPA filter i cant remember the number 6637 maybe im not sure.
-----------jeremy

 

Their proably isn't much difference in the two. The K&N uses a more pourus filter(coated w/oil) to pull more air while the Baldwin(NAPA)just has more surface area. I don't trust the K&N for this reason. Plus I hate oiling the filter and all.

 

Is this what your looking for:

FLOW RESTRICTION FROM BEST TO WORST:
FILTER RESTRICTION in Inches H2O
K&N 4.54
Mystery bargain filter 4.78
AFE Pro Guard 7 Panel 4.99
Purolator 5.05
WIX/Napa 5.06
UNI 5.40
Baldwin 5.71
Amsoil 5.88
AC Delco 6.23

 

Thanks thts some awesome specs, looks lke im stickin with my k&n.
-------------Jeremy

 

i'd rethink that, air flow isnt everything when talking about air filters. i mean if the filter isnt filtering everything out then why have one at all? the K&N may flow more but i garauntee the 6637 filters better! diesels just pull way too much air for a K&N

-cutts-

 

if you run the K&N just make sure you oil it on a regular basis. With the amount of air that the diesel sucks throught it it pulls the oil out pretty quick.

 

OK thanks, The reason I was asking this is because when I put this on I recieved no change in mileage and maybe only a little change in power.

 

I have seen this comparison before and there is another part to it. The ac delco is the best at filtering while the k&n is the worst. I really like the 6637 because I dont have to wait all day for the stupid filter to dry after I clean it.

 

i wonder how many cfm this was measured at? well i run the baldwins here

 

I wonder who sponsored that bogus test. I mean come on....the factory GM filter outperforms every other manufacturer.....what a crock.

 

I put in another vote for baldwin run it on every piece of equipement I would like to keep.

 

Info was from AFE Pro Guard. They also showed a comparison on the amount of dirt that they let by, but he did not ask for that. If you want it, I can post the whole thing. I was just trying to provide info that was requested, not make a recomendation.

 

I had heard from the stealerships here in town, don't run the k&n because they don't filter enough. On here they call it dusting the engine. The k&n just can't hold up to the suction the diesel has!! I used to run the k&n in my gassers and my diesel until I heard it here and from the stealership. I also vote for the 6637 or equivilent.

 

the 6637 flows 450 cfm

 

Another ??? I head of using a john deere air filter and 4 inch stainless tube instead of my stock filter and box on my 02 f350 4x deisel. Somebody got a part # and some advice???