AIS filter
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Mountain Pass
Joined: Jul 2011
Posts: 224
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From: Taylorsville, KY
AIS filter
I have the AIS filter setup on my 2000 F250 but the previous owner installed a K&N filter in it. It appears that the K&N's aren't well thought of an I was wondering what filter I should use to replace it. Would I be just as well off to replace the whole setup with the 6637 mod? Thanks guys, this forum has given me the jump start I have needed to get me off my back side and back outside doing the things I used to love doing, mainly playing with my truck!
Elder User
Joined: Sep 2011
Posts: 659
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From: Millstone, NJ
Is this the filter you are talking about?Riffraff Diesel: Ford AIS Extended Life Filter Kit
K&N drop-in filters are no good with the stock air box. Some have reported dusting of the turbo running the K&N drop-in filter with the stock air box.
If you have the Ford AIS filter like the one in the link, then just get an AIS replacement filter for it. See here: Riffraff Diesel: Motorcraft AIS Replacement Filter
I have the 6637 on my truck with zero problems. And they are cheaper to replace. There is nothing wrong with the AIS setup though. The lid on the stock air boxes tend to warp and cause unfiltered air to come through.
Just a little extra info for you. Hope this helps.
K&N drop-in filters are no good with the stock air box. Some have reported dusting of the turbo running the K&N drop-in filter with the stock air box.
If you have the Ford AIS filter like the one in the link, then just get an AIS replacement filter for it. See here: Riffraff Diesel: Motorcraft AIS Replacement Filter
I have the 6637 on my truck with zero problems. And they are cheaper to replace. There is nothing wrong with the AIS setup though. The lid on the stock air boxes tend to warp and cause unfiltered air to come through.
Just a little extra info for you. Hope this helps.
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Joined: Dec 2011
Posts: 13,323
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If you are sure you have the AIS kit, then get the FA-1757.
I've bench tested a lot of air-boxes and air filters, but I've never heard of a K&N drop in to replace the element in the oval shaped AIS air box.
I have heard of, and have tested, the rectangular shaped K&N and equivalent S&B drop in panel filters for two different versions of the stock air box. You heard right, avoid the stock box AND the K&N.
If you really have the oval shaped AIS, then your very best option also happens to be the cheapest. The Motorcraft FA1757 is $67.00 online, or $72.00 at Clay's.
By the time you're done doing a Tymar / 6637, you'd be looking at about $80.00, depending on where you sourced your plumbing. It could easily shoot north of $100, and you would lose some of the benefits people pay $200.00 for when they upgrade to the AIS.
Now, if you have a stock air box (filter is rectangular), then you have a choice to make. But if you already have the AIS box, there is really no better choice than to buy the filter designed for it.
I've bench tested a lot of air-boxes and air filters, but I've never heard of a K&N drop in to replace the element in the oval shaped AIS air box.
I have heard of, and have tested, the rectangular shaped K&N and equivalent S&B drop in panel filters for two different versions of the stock air box. You heard right, avoid the stock box AND the K&N.
If you really have the oval shaped AIS, then your very best option also happens to be the cheapest. The Motorcraft FA1757 is $67.00 online, or $72.00 at Clay's.
By the time you're done doing a Tymar / 6637, you'd be looking at about $80.00, depending on where you sourced your plumbing. It could easily shoot north of $100, and you would lose some of the benefits people pay $200.00 for when they upgrade to the AIS.
Now, if you have a stock air box (filter is rectangular), then you have a choice to make. But if you already have the AIS box, there is really no better choice than to buy the filter designed for it.
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