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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Filter kit
Wish i would have done this yeats ago.
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Donaldson filters are the best
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Great products
Filter kit fit perfectly and arrived in a timely manner
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Air filter kit
This had an immediate Impact on the performance of my engine and it’s abilities to get more air which in turn means faster acceleration. I would recommend this product to anyone and will continue to get more
RiffRaff parts. -
6637 Filter Kit
Hardest part was taking the old airbox out (easy). This kit is too easy!
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Worth the money
Instant performance. You can feel the truck breathing better. Thanks!
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RiffRaff 6637 kit
It was easy to install with a minimum amount of tools. It was in 15 minutes after I opened the box. Very pleased in the way my truck sounds and I can feel a difference in the low end when going hard on the gas.
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Riff Raff 6637 Filter Kit
Great product, Intake elbow and t clamp are great quality and it’s a very fast install. Performance is noticeable. Good customer service too.
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02 excursion
Went right on after factory air box is removed






