6637 Replacement Filter

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Donaldson 6637 Replacement Intake Filter for Ford 7.3L 94-03

We suggest buying them in quantities of 2 as your shipping won't increase much and you will save money.

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  • 5
    6637 replacement filter

    Posted by Scott on Jul 28th 2020

    Great filter, I have used these Donaldson Filters for years. Delivery was on time as always.

  • 5
    Great price deal

    Posted by JoJo on Jun 10th 2020

    Item was just what I needed at a great price. Thank you

  • 5
    Air filter

    Posted by ZG on Jun 7th 2020

    Works great, really makes the turbo scream

  • 5
    Best Filter for your 7.3

    Posted by Matt on May 26th 2020

    100 times better than stock. Stock air box and filter have the possibility of leaking around the filter. Easy to install the 6637 and sounds amazing too, remove stock air box and this will fill in the void perfectly. When buying this keep in mind that you need a 4 inch piece of tube to connect it to your turbo intake hose. I used 4 inch exhaust that was about 5 inch long. The filter seals perfectly around the material without clamps too.

  • 5
    Great filter

    Posted by Ricky on May 16th 2020

    Great product

  • 5
    Best price

    Posted by G on Apr 11th 2020

    Fits great, good upgrade over stock, wakes truck up,

  • 5
    6637 Filter

    Posted by Unknown on Feb 12th 2020

    Fit right in and works good.

  • 4
    Tight fit but works nice thanks riff raff

    Posted by Cameron on Jan 31st 2020

    Great product for price

  • 5
    6637 Filter

    Posted by Kieran on Jan 12th 2020

    Great air filter surface volume. Their filter kit is great as well. I usually cut the pipe a little short if using the stock outlet hose from the filter to the ccv ring.