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
474 Reviews Hide Reviews Show Reviews
-
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.
-
Fantastic
Great product, great packaging, fast shipping. Filter looks great and installed easily, nice finish on the tube. and nice clamp, would recommend!
-
Filter kit
Easy to install and great components! KISS
-
Donaldson 6637
This is a great kit for the money. Removed stock airbox,bolts right in.
-
Improved performance
I bought the donaldson blue with early 99 elbow, over stock this kit performs fantastic and lets the truck breathe. Strongly recommend.
-
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.
-
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
-
Great quality
Great quality product. Shipped to me quicker than expected. Installed in about five minutes. And is works amazing
-
6637 filter kit
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.






