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 AIR FILTER

    Posted by JERRY C on Oct 20th 2018


  • 5
    A must have upgrade

    Posted by Unknown on Sep 19th 2018

    I installed the upgraded filter kits to both my 7.3 power strokes from riffraff diesel about five years ago and they work amazingly. These filters keep the intakes clean, affordable and super easy to replace.

  • 5
    Best price

    Posted by Joe C on Aug 7th 2018

    I will always buy my replacement filters from Clay and Riffraff

  • 5
    Cheapest price around.

    Posted by Z31freakify on Jun 7th 2018

    I have bought in 6's at least 3 times now, saves you a buck long term. Riffraff is the cheapest price I have found for this filter.

  • 5
    First time buyer

    Posted by Diesel Doghouse on May 30th 2018

    It fit just fine. First time ordering one and wasn't sure what to get, on line chat was very helpful!! Was not damaged in the shipping, they even included, unabashedly, some RiffRaff stickers for their own advertisement. LOL

  • 5
    Really good

    Posted by Stephen on May 4th 2018

    I will always buy this filter and not the over priced napa 6637 filter ...overall i love it . it give a massive amout of clean filterd air for my 96 powerstroke .also best price i have seen.

  • 5
    Great Deal

    Posted by Unknown on May 3rd 2018

    Best deal for the money. Order 2

  • 5
    Product cheaper here..

    Posted by Unknown on Apr 6th 2018

    Cheaper than the average auto parts store great product. Arrived on time. great air filter.

  • 4
    just what i expected

    Posted by Unknown on Feb 26th 2018

    riffraff has always been my go-to for parts and whatever i need for the truck, quality stuff at good prices