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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Great
Truck runs cooler, much easier to replace, and looks as good as it functions
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6637 filter kit
Awesome product!!!!
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Great quality, great price!
Very surprised with the quality for the money! Noticeable difference in throttle response! Fast shipping as well! Highly recommend this product as well as Riffraff Diesel!
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Great quality product
This is the best setup for an air intake gives you increased throttle response and makes your motor way happier receiving lots of clean air
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Sounds good and filters much better!
Ordered the blue donaldson, along with a billet wheel, sounds much better, filters better and looks much cleaner! Very happy!
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Nice kit, easy install.
I received my kit yesterday, and installed it right after work. It took about an hour. But that included removing the air box and battery box. Completely removed air box, and trimmed the tabs on the battery box.
Made a difference driving to work today. Slightly louder on the hills, but not on the level. I have the Blue filter. -
completely unbelievable. Donaldson blue
I'm still in shock how much this changed my truck, it's it was like going from a carburated 6cyl to a fi v8. My truck lurches forward from stop lights instead of crawling. I towed our 5th wheel to the lake the week before the install and usually kept it floored going up the hills, the week after I put this in I pulled the 5th wheel to the same spot and had to use almost half the trottle as before, found myself above the speed limit going up the hills. If you are on the fence don't stay there!
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Air filter
Fast shipping super fast install great qaulity product truck has more of a whistle now sucks a lot more air for aure
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Early Bird
Bought this for my Early 99 and installed with tuner and pyro gauge.
Great Fit with no increase in noise level. Thanks Riffraff






