K&N or 6637 filter for DIY??????? - Ford Powerstroke Diesel Forum
View Poll Results: Both Filters cos $40...Which should i get?
Napa 6637 Filter 16 94.12%
K&N 4" filter (link in thread) 0 0%
Other...(tell me in the thread) 1 5.88%
Voters: 17. You may not vote on this poll

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post #1 of 11 Old 02-16-2008, 10:48 AM Thread Starter
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K&N or 6637 filter for DIY???????

so the local parts house can get me the 6637 filter to use with my DIY intake for $40. I was just lookin on eBay and there is this filter. Its a K&N with 4" inlet. Would this flow better??? I'm thinking i should get it since its the same price as the 6637 and it's washable.

Any more recommendations on the best filter to use for around $40???

Typical cummins owner.

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post #2 of 11 Old 02-16-2008, 10:53 AM
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Quote:
Originally Posted by taylorking View Post
so the local parts house can get me the 6637 filter to use with my DIY intake for $40. I was just lookin on eBay and there is this filter. Its a K&N with 4" inlet. Would this flow better??? I'm thinking i should get it since its the same price as the 6637 and it's washable.

Any more recommendations on the best filter to use for around $40???
IMO the K&N doesnt filter well enough and is a gamble on harming your engine....

i would do the 6637 if i was you
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post #3 of 11 Old 02-16-2008, 10:58 AM
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+1 for the 6637. You won't believe how HUGE this filter is until you actually see it.

I've always heard bad things about K&N's on diesel applications.

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post #4 of 11 Old 02-16-2008, 11:00 AM
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Also buy it from fleetfilter lots cheaper then nappa

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post #5 of 11 Old 02-16-2008, 11:05 AM
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yeah the 6637 is 25 from fleetfilter. Definitely stay awan from k&N I made that mistake and I just bought an amsoil filter to replace it. Much bigger and flows a lot better

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post #6 of 11 Old 02-16-2008, 11:40 AM
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I used to have the K&N, but decided I would try the NAPA based on what ORG users were saying. I've been running it for 2 months and have already noticed that it's cleaner under the hood, not near as much dusty oil residue. The filter is also a hellofva lot bigger As far as performance goes, I could not tell any differ.

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post #7 of 11 Old 02-16-2008, 11:53 AM Thread Starter
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wow ok i'll definitely stick with the 6637 filter. Seems like you guys know what you're talking about.

thanks!




Typical cummins owner.

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post #8 of 11 Old 02-16-2008, 12:01 PM
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20 bucks is a GOOD price. I ordered a Baldwin PA2818 for $46 with shipping. Won't do it again. Go with the 6637.

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post #9 of 11 Old 02-16-2008, 01:13 PM
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Wow, my NAPA parts store charged me 51.00 +tx for 6637. I really like it though talk about opening up the air flow.

97 F-350, 7.3 psd, xlt, limited edition, obs, dually, E40d at, 410 r axle, reg. cab, 8ft bed, 145000 miles, DIY Tymar intake (napa filter) CCV mod. fpr bb mod, HPX crossover pipe, SS Bully steps, Reese Fifth wheel hitch, CB Radio, 3" DP /4" back w/cat delete and 4" flow-thru muffler w/5" tip.
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post #10 of 11 Old 02-17-2008, 12:43 AM
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Definatly the napa filter!!!

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