"Warning" against 6637
Senior User
Joined: Apr 2008
Posts: 469
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From: Santa Fe, NM
Was at the shop of a very well known mechanic and diesel man today who was working on my truck. He has a duracrap that puts out some nice numbers and does tuning for sled pull trucks and stuff like that. He commented on my 6637 "I highly recommend that you change filters, the paper from the inside of the filter can be sucked off during high boost" Something along those lines. He said a fiber/oil element is the only way to go - but make sure you keep it oiled! He said he has seen these filters eaten from the inside out from the turbo sucking so hard. Any one buy this? Im a little skeptical ...
Thats about the time that my selective hearing switched on.
Gone, but not forgotten
Joined: Oct 2005
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From: Charlotte-Fairbanks-Bflo
I suppose me pointing this out is really BS, but is that not what I implied a few posts back?
Thread Starter
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Posting Guru
Joined: Oct 2007
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From: Bloomfield Hills, MI
I never thought this guy was right at all - was just curious if anyone experianced this or has heard this from other people. I trust any of you guys with what you tell me, i never second guessed the great minds at FTE 
Postmaster
Joined: Sep 2006
Posts: 3,048
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how bout me running upwards of 40# of boost and still have 6637 in one piece. did few runs over 120mph still in one piece. did dragracing and it still survived...
so i would not worry about 6637 , K&N is junk and they can run them on Duracraps . LOL
so i would not worry about 6637 , K&N is junk and they can run them on Duracraps . LOL
Postmaster
Joined: Dec 2005
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Running a year and a half plus on my 6637 filters. Im on my second one now, and my intake has never been this clean. When I took off my intake tube recently(its been a LONG time before that), it was clean. I wiped my finger in the tube and nothing was in there at all.
I think running compounds it might decide to eat the filter, but at up 50PSI, I would think that filter would be fine.
Where was this duramax guy located?
I think running compounds it might decide to eat the filter, but at up 50PSI, I would think that filter would be fine.
Where was this duramax guy located?
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Posting Guru
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From: SE Wisco
If a 6637 were to get water on it I could certainly see it peeling apart from the inside. This is the reason some suggest using the 46637(???) that was designed for the marine applications. It has some sort of waterproofing. I here the reason most don't use this is bc of the price (about twice as much) and not everybody has heard about it. If anyone knows more than this or can correct me please do. This is all hearsay info with no data to back it up.
Posting Guru
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From: SE Wisco
I disagree, the stock paper filter is a wierd sort of paper compared the the 6637 paper. Get each of them wet and I could be the 6637 will flake off in layers first.
Post Fiend
Joined: Apr 2007
Posts: 7,241
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From: Powder Springs, East TN
I believe your duramax man was just trying to sell you on his stuff, he's just jealous because you suck in more air then he can with his headlight off 
. I have ran a 6637 for well over a year and it works well and cheap for me, it looks really great with a Pete's cover.
Anyone that is a salesman will always tell you their stuff is better, about like a Superchips dealer told me my DP-Tuner was junk because any chip you put into the back of your PCM was just asking for trouble and they couldn't provide the safe EGTs and power of his superchips.
. I have ran a 6637 for well over a year and it works well and cheap for me, it looks really great with a Pete's cover.Anyone that is a salesman will always tell you their stuff is better, about like a Superchips dealer told me my DP-Tuner was junk because any chip you put into the back of your PCM was just asking for trouble and they couldn't provide the safe EGTs and power of his superchips.
Post Fiend
Joined: Feb 2006
Posts: 11,892
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From: Middle Tennessee
Sorry, couldn't resist that line. I have no facts to back that up, but know my truck has been running the 6637 for about the last 5 years. No problems. I have seen my block/engine dripping with water from the humidity (condensation) in the AM before startup. That filter is about saturated but no problems. IDK what you may be talking about.
Posting Guru
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From: SE Wisco
Uhhmmmm, how about no, Scott, OK. Sorry, couldn't resist that line. I have no facts to back that up, but know my truck has been running the 6637 for about the last 5 years. No problems.
I have seen my block/engine dripping with water from the humidity (condensation) in the AM before startup. That filter is about saturated but no problems. IDK what you may be talking about.
Sorry, couldn't resist that line. I have no facts to back that up, but know my truck has been running the 6637 for about the last 5 years. No problems. I have seen my block/engine dripping with water from the humidity (condensation) in the AM before startup. That filter is about saturated but no problems. IDK what you may be talking about.
Post Fiend
Joined: Jun 2004
Posts: 9,293
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From: Parker, CO
You could always show that guy the pictures in this thread. It's the latest turbo damaged from using a K&N filter: Installed my DIY intake and I have nicks on my turbo! - The Diesel Garage Forums
Oh, and as for getting the 6637 wet. Short of opening the hood and dumping a bucket of water on it, you won't get it wet. I ran it for several years in my truck, and driving through snow/mud/rivers/etc not once did it get hit with anything. Stayed dry as a bone. Humidity doesn't affect it either. I've driven down to the darkest swamps in Louisiana.
Oh, and as for getting the 6637 wet. Short of opening the hood and dumping a bucket of water on it, you won't get it wet. I ran it for several years in my truck, and driving through snow/mud/rivers/etc not once did it get hit with anything. Stayed dry as a bone. Humidity doesn't affect it either. I've driven down to the darkest swamps in Louisiana.
Lead Driver
Joined: May 2007
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From: Flagstaff, Arizona