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


1994-Early 1999 Powerstroke production date 12-7-1998 and before
Late 1999-2003 Powerstroke production date 12-7-1998 and after
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  • 5
    Best filter on the market

    Posted by Brady on Apr 21st 2021

    I would recommend this 100%. Easy installation probably took about 30 minutes at the most. Well done Riff Raff!

  • 5
    6637 filter

    Posted by Jeremy on Apr 19th 2021

    Great fitment easy installation best airflow for the money

  • 5
    Filter kit

    Posted by Jimmy on Apr 16th 2021

    I got the blue version as well as the new battery tray and filter bracket. The bracket is still on the bench as I have not gone to the hardware store for fasteners and washers. The entire instillation of the kit and battery tray without the bracket took about one hour as I used some of the time to do some cleaning as well. Easy kit and the truck does seem to run better with it. Also no more cracked filter box.....

  • 5
    Quality Product

    Posted by Irvin Hoeflick on Apr 15th 2021

    Came with everything I needed to install the kit and is a very nice quality part, would highly recommend to anyone interested in installing an aftermarket air filter.

  • 5

    Posted by Jeremy B. on Apr 11th 2021

    It's exactly whata described and its an amazing fit, makes the truck sound better too. You can hear that turbo more and the wastegate!

  • 5
    Great product

    Posted by Aaron on Apr 11th 2021

    Recieved it fast, went in quick and easy, looks great and the turbo is much louder now. Awesome addition.

  • 5

    Posted by Doug on Mar 31st 2021

    Great quality and fitment. Will be back again for more.

  • 5
    6637 kit with Blue filter

    Posted by allen beauvais on Mar 30th 2021

    Great Kit! I can't believe how much more I can hear my turbo. This is a must have if you have upgraded your turbo wheel and are still using the stock box. Boost spools is much better and EGT down a pretty noticeable amount!

  • 5
    6337 kit

    Posted by Nick on Mar 28th 2021

    Works great. Bought the optional v10 battery tray to help with cleaning it up and fitting the filter better. Didn't notice a sound difference except for shifts. As I did not want it louder in cab. Notice a small performance gain as of 1 week pulling a 16 ft enclosed trailer. Will be back for more riff raff for my 7.3