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
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6637 kit with Donaldson filter
My initial impressions are this is a great product and the service from Riffraff was exceptional; no complaints. I have less than 1,000 miles on the kit so far, so I'll have to update this review later on longevity, but at this price, I couldn't be more pleased.
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Great 6637 kit
High quality kit the 45° is powder coated steel, high quality filter(s) by Donaldson, they didn't even cheap out on the clamp (which they should sell separately and in different sizes for other uses). Everything fit perfectly
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Filter kit
Well thought out. Everything needed to complete the install without the crazy high price of some of the other kits
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Quality
This filter is massive. Coupled with the 4" straight pipe my truck feels more responsive and less like a turtle. Was very pleased that the coupler is powder coated metal.
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6637 filter kit
Great fit and a great upgrade, truck breathes so much better
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filter kit
great product!
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Best bang for your buck!
installation was very easy. I also bought the black cover. Looks very nice in engine bay and flows a lot. It also sounds sweet with a 4" straight pipe!
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6637 Filter Kit w/AFE Big Boost Filter
Easy install and very clean set up. Improved throttle response. I could tell the engine enjoyed the upgrade. I would recommend RiffRaff and this product for sure!
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Intake Kit
Great kit. Straight forward installation and I felt a difference immediately over the stock intake.






