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 $35)
- 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
    Definitely worth it

    Posted by Noah on Nov 11th 2019

    It looks good, sounds good, and even made the truck feel like it had a little bit more power. Had to trim the factory air box to make it fit the way I wanted it too, but looks and functions really well.

  • 5

    Posted by Tyler on Oct 22nd 2019

    Great product, great packaging, fast shipping. Filter looks great and installed easily, nice finish on the tube. and nice clamp, would recommend!

  • 5
    Filter kit

    Posted by John O. on Oct 2nd 2019

    Easy to install and great components! KISS

  • 5
    Donaldson 6637

    Posted by Glenn coker on Sep 26th 2019

    This is a great kit for the money. Removed stock airbox,bolts right in.

  • 5
    Improved performance

    Posted by Tyler on Sep 11th 2019

    I bought the donaldson blue with early 99 elbow, over stock this kit performs fantastic and lets the truck breathe. Strongly recommend.

  • 5
    6637 Filter Kit

    Posted by Tom B on Sep 9th 2019

    This is good quality. I had a Tymar system installed on my truck when I bought it (same filter). Things were looking a bit worn and corroded so I bought this kit. The elbow for my 96 7.3L is not long radius like the Tymar unit, so this setup is a bit short and the elbow hits my master cylinder. However, it is an acceptable fit. Also, this kit costs less than just the filter at Napa, so I am happy.

  • 4
    Filter kit

    Posted by Unknown on Sep 8th 2019

    Filter kit worked great, the customer service coming from this company is litteraly the best I’ve ever experienced. Friendly and quick to fix a mistake on my end with out hesitation. Will defiantly be coming back

  • 5
    Great quality

    Posted by Thomas Tracey on Sep 8th 2019

    Great quality product. Shipped to me quicker than expected. Installed in about five minutes. And is works amazing

  • 5
    6637 filter kit

    Posted by t. wayman on Sep 6th 2019

    This is an easy to install kit. The filter looks like it is 4x more area for the air to go through vs the stock setup. Good, quality parts included make this an easy way to add an open element filter. I did notice a lot more vibration through my brake pedal, but I have not trimmed up any of the lower panel that goes around the driver's side battery yet, so the filter rests up against the brake master cylinder. I plan to trim it up soon.