Riffraff Diesel 6637 Filter Kit

Part Number:



Riffraff Diesel 6637 7.3L Intake Filter Kit

This kit contains: 

- Donaldson 6637 Filter
    - Optional AFe Big Boost washable, or a Donaldson Blue® Filters
- Custom "Riffraff Diesel" Pre-filter Cover (Optional $29)
- Powder Coated Adapter Tube 
    - 94-Early 99 Uses a 45* Mandrel Bent Tube
    - Late 99-03 Uses a straight Tube
- SS T-Bolt Clamp


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  • 5

    Posted by Derek on Aug 13th 2020

    Easy to do...had oldboy out and this installed in 10 minutes...works great...can finally hear the turbo

  • 5
    Would highly recommend

    Posted by Bryan on Aug 4th 2020

    Great quality love how it looks overall would highly recommend this product honestly.

  • 5
    High flow, great performance

    Posted by 6637 Intake w/ AFE big boost on Jul 19th 2020

    The filter is enormous. Ample surface area to draw in much greater air flow over the stock filter. The turbo spools in much lower rpm range, and the turbo also sounds stronger. Increased my MPG by about .75 of a gallon, minuscule, but does seem to help a little. Not to mention I’ve got my foot in it more often now. Gave me A power boost that I could feel in my seat. For $110ish you can’t beat it. I was hesitant to buy this instead of the S&B or K&N, and if you are too take my word for it. You will not be disappointed.

  • 5
    Big blue Donaldson filter kit

    Posted by Cody on Jul 14th 2020

    Easy to install. Works great

  • 5
    Filter Kit

    Posted by Alex on Jul 13th 2020

    Very easy to install after a slight modification to the firewall.

  • 5
    Good upgrade for F-550

    Posted by Michael on Jul 8th 2020

    Added this to my 2001 F-550 as it was a birthday gift from my wife, it was the blue Donaldson with the hardware included. Work with many different non-highway Diesel engines for a few different companies, all have used Donaldson filters most of our diesels are out living the hour meters great filters great prices here. 20 minutes 4 beers and you have a noticeable upgrade for your 7.3L, thanks

  • 5
    LOVE IT i can tell that my turbo is breatheing better as well can fell it running better as well

    Posted by Randy McDuffee on Jun 16th 2020

    LOVE IT well worth tge money and easy install

  • 5
    Filter kit

    Posted by Mike on Jun 16th 2020

    Wish i would have done this yeats ago.

  • 5
    Donaldson filters are the best

    Posted by Raul rojas on Jun 7th 2020