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 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.

  • 5
    Air filter

    Posted by Don on Dec 28th 2019

    I replaced my spectra cold air intake with this filter,tired of maintaining and oiling,,this filter is an improvement,will continue to use this filter think engine breathes better,easy install with a 4in.exaust pipe which local shop gave me..will continue to buy parts from riffraff.

  • 5
    Great product

    Posted by Larry on Oct 18th 2019

    Purchased this filter for my Ford F250 for years. Unfortunately I sent this order back because my truck was totaled.

  • 5
    Better than stock

    Posted by Jon on Sep 9th 2019

    Good product, much better than stock on my 97 f250 PS.

  • 5
    Big ass Filter

    Posted by JP on Sep 4th 2019

    Removed the K&N after reading flow and filter performance tests. This filter will not fit in the stock air box!! 2001 F 250 BUT it will let your engine breath with the Best filtering performance. The washables are all junk, pure hype.

  • 5
    6637 Replacement Filter

    Posted by Jon Dore on Aug 14th 2019

    Every 7.3 should be running these. You should also buy these from RiffRaff because Napa charges 65 bucks for the same filter. Plus why not but from a great company that supports all us diesel bros.

  • 5

    Posted by Chad on May 28th 2019

    Great product, great customer service.

  • 5
    6637 filter

    Posted by Mike on May 19th 2019

    Great filter an a amazing price

  • 5
    6637 Air Filter

    Posted by Jerry on Apr 8th 2019

    Great value and fast shipping.