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
473 Reviews Hide Reviews Show Reviews
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Donaldson Blue 6637 kit
It’s ok. Little pricey for the band clamp and metal tube. Hood on truck won’t close all the way down flush as filter diameter is too big. It will close just not flush. Nice piece though and seems to help.
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Big Improvement
Had a K&N that was in there when i got the vehicle. Put this in and wow , Huge Improvement. Plus it’s easy to get in and out. Looks good as well. Very happy.
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Quality
Filter and cover are nice, but would've been nice to have more then 1 hose clamp I had to order the other hose clamp elsewhere.
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6637 Filter Kit
Perfect fit and excellent function! Top quality materials. Riffraff for the win once again.
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Big filter kit OBS 7.3
Looks good and breaths real easy I deal it’s way cheaper than the fancy high flow intake systems with the same or better flow for less$ . Shipping was fast riffraff always delivers fast with great products. Thanks
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6637 filter kit
Best kit out there!! Will never go with anything other than this kit.
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Great filter setup
PO had used OEM filter and box for 235k mi. The pipes were actually clean and turbo fins were in great shape, but he was a careful guy. This is the best setup though, hands down.
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Air filter
Hands down one of the best upgrades you can do with your 7.3 powerstroke thanks again RiffRaff Diesel performance!
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Filter kit
Should've bought this long ago. Now the filter isn't pressing up against the brake components or anything. Lays in the filter area nice and proper.






