Riffraff Diesel 6637 7.3L Intake Filter Kit
This kit contains:
- Riffraff Diesel 6637 Filter
- Optional AFe Big Boost washable, or a Donaldson Blue® Filters
- Custom "Riffraff Diesel" Pre-filter Cover (Optional $29)
- Filter Adapter Tube
- 94-Early 99 Uses a 45* Tube
- Late 99-03 Uses a straight Tube
- SS T-Bolt Clamp

Late 1999-2003 Powerstroke production date 12-7-1998 and after
475 Reviews Hide Reviews Show Reviews
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Air intake
Easy instillation and turbo sounds a bit better.
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Definitely worth it
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.
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Fantastic
Great product, great packaging, fast shipping. Filter looks great and installed easily, nice finish on the tube. and nice clamp, would recommend!
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Filter kit
Easy to install and great components! KISS
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Donaldson 6637
This is a great kit for the money. Removed stock airbox,bolts right in.
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Improved performance
I bought the donaldson blue with early 99 elbow, over stock this kit performs fantastic and lets the truck breathe. Strongly recommend.
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6637 Filter Kit
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.
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Filter kit
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
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Great quality
Great quality product. Shipped to me quicker than expected. Installed in about five minutes. And is works amazing






