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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6637 Filter Kit
Installed on a 2000 F250SD, quick & easy. First thing noticed is less nickels (black smoke) out the tail pipe. I'm looking forward to less snow on the ground to see what it will do in daily driving & pulling a 10k 5th wheel.
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What a difference!
From throttle response to gas mileage, your 7.3 needs this NOW, easy to install, and looks great. I love driving my truck now...incredible!
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Riffraff 6637 Kit
Great product at a great price. Everything came how it was supposed to, and fit perfectly on my 2002 F-350. Made a huge difference compared to my factory filter setup, the truck breathes much better now. Definitely recommend this product.
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Easy install Quality item
Put this on my 99 F350 and noticed a difference right away comes with quality hardware too.
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Good fit, Great function.
A great option for those who use their truck in dusty conditions or just don't want to spend $250 on a big name intake. No complaints on this product, highly recommend it!
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Best Price!
Can't beat this deal here. Installed it on my 2001 f250 and there is a noticeable difference from stock.
Simple install, I found that you can retain all the stock parts (sans the top pieces) by removing the securing bolts from underneath the battery/intake box and sliding the whole thing forward roughly. 2-3 inches. It allowed for the extra clearance and now drilling/ cutting!
Definitely worth the buy considering the price! -
Simple, effective and cheap!
After much consideration I ended up with this intake system. First off its easy to install and looks clean under the hood. There are many guys around running the Napa intake and this hardware is the exact same.






