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 Product
Quick and easy install. Would agree with most other reviewers on being pricey and the cutting up the old air box for better fitment. But, its a modification, not a R&R. Overall its a great product.
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Easy Install
Slightly on the pricey side but the easy install and quality cant be beat. Took about 15 minutes to install and the turbo sounds great
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Big Ass Filter
over all love the product, wish I didn't have to cut up the stock battery box (tabs from the stock filter to install it.
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great intake!!!!
Very tight fit for 2002 f250 7.3 but other than that it's perfect
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Good filter, good price!!
This filter made a noticeable improvement in my 97 F350 7.3L Powerstroke from the very first second I started the truck. For the price you can't beat it!!!
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Great bang for the buck
Mine is the early 99 version and I had to play with the angles of rubber snorkel to the 4" 45 degree piece to get correct fit.Used tune up silicone lube on air inlets to aid rotation. A little tight between battery and fuse box but fits well.
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Great Deal, Great Product
Product was very easy to install. The best of the best included in the set. I saw instant acceleration response. Will definitely be a return customer
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Its alright
I purchased this because I read on multiple forums that this is a good replacement for the stock airbox. Not sure how true that is, but here is my review:
Installation was a piece of cake; it took about 20 minutes. When I went on my first test drive I noticed take off from a dead stop was slightly improved. I have yet to do a hand calculated MPG test but I believe there maybe some improvements.. Will be doing one soon. Turbo whistle is slightly louder as well. Overall it was a good buy for just under $100 you get a filter, clamp, and a fashionable sock for the intake. 4/5 stars because fitment could have been slightly better. I had to wedge the filter in and it is a snug fit. I wish there was a box for it for even more filtration. I also wish this filter was made with water resistant material. Still earned 4/5 stars in ny book. -
Super easy install
Very easy to install once I got my factory air box out of my 96 Powerstroke. Can definitely tell a difference in the way the engine runs smoother. Gained almost 1 MPG as well. Would definitely recommend this kit to anyone!






