K&N Filter
FTE *******
Joined: Jan 2004
Posts: 112
Likes: 0
From: Washington
Originally Posted by amiller93
If you want it quiet and clean the AIS upgrade is well worth it. Much better filtration than almost anything.
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Senior User
Joined: Oct 2004
Posts: 374
Likes: 0
From: Ridgecrest, CA
I'm another vote for the AIS. Put one in mine cause the stock air box was letting dust in. One of the shops had a great price on them.
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Post Fiend
Joined: Jun 2006
Posts: 9,714
Likes: 2
From: White Mnt's,New Hampshire
AFE stage 2 with proguard 7 filter...i love it..makes the turbo sing...have a big hill out front of the house..climb it at 50 with a K&N box and stock exhaust..added the AFE and my 5" strait pipe and climb the same hill at 57...added the dp tuner put in 80 econo and now climb it at 96 and run out of room..
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Senior User
Joined: Mar 2001
Posts: 320
Likes: 0
From: Fremont, NE
Well I found the AFE Stage 2 on Ebay for 340, so I bought it and it is on the way. Cant wait to install it!
I think the muffler is coming off next, how loud is it without the muffler with stock exhaust?
I think the muffler is coming off next, how loud is it without the muffler with stock exhaust?
Senior User
Joined: May 2002
Posts: 298
Likes: 0
From: San Diego, CA
I dunno, personally, I think any red colored filter paper is ultimately made by the same company and rebranded to whoever they have contracts with (ie: K&N, S&B, AEM, Airraid, etc.)
I used to be a red filter guy with all of my gasoline engines. I did notice that most of my engines with red filters start to burn more oil. From my Honda Civic to my Ford Expedition. They all started to burn more oil with the K&N style red filters. I will not use anything other than OEM brand filters, Wix or Fleetguard (cummins filtration) filters. Brands that do not release nominal micron ratings or flow specs don't get my business. Fleetguard (now cummins filtration) or WIX tech support will give you all the information you need when inquiring about nominal micron ratings and/or flow specs. It is very hard to find any other company that will even disclose some of this info. Even Racor brand doesn't disclose this info. It is also hard to find a filter that will flow lots of air w/o compromising filtration. Fleetguard is the only company that can show me that.
I used to be a red filter guy with all of my gasoline engines. I did notice that most of my engines with red filters start to burn more oil. From my Honda Civic to my Ford Expedition. They all started to burn more oil with the K&N style red filters. I will not use anything other than OEM brand filters, Wix or Fleetguard (cummins filtration) filters. Brands that do not release nominal micron ratings or flow specs don't get my business. Fleetguard (now cummins filtration) or WIX tech support will give you all the information you need when inquiring about nominal micron ratings and/or flow specs. It is very hard to find any other company that will even disclose some of this info. Even Racor brand doesn't disclose this info. It is also hard to find a filter that will flow lots of air w/o compromising filtration. Fleetguard is the only company that can show me that.
Snowboard season cometh..
Joined: Jan 2006
Posts: 5,406
Likes: 1
From: Gulf Coast of Florida
I bought an AIS based on what I read here, and the advice of a friend. This friend has been a Ford mechanic for 25+ years and told me about a training class he went to in Denver just after the AIS was released. The instructor had a 2000 7.3 PSD auto and put and test the K&N panel filter, AFE, and others, along with the AIS. Fresh oil change before changing intakes. He did an oil analysis after running each setup and the AIS had the cleanest results by far. All others allowed more air, and felt "crisper", but the oil was much dirtier, which would lead to more wear on internal parts. For my money, you can't beat the AIS. I just added the foam fender sleeve this weekend so we'll see if that does anything noticeable.
Was the 'test' official? NO. Just a real-world diesel mechanic testing equipment in real-world conditions so that he would know what he was talking about, and not spewing back the marketing mumbo-jumbo.
Was the 'test' official? NO. Just a real-world diesel mechanic testing equipment in real-world conditions so that he would know what he was talking about, and not spewing back the marketing mumbo-jumbo.