I've been running this filter for years and it's excellent. Durable, great flow, easy to service, great whistle, and so easy to get from RiffRaff at nearly half the price of NAPA. At least the last time I checked. Delivered so fast it'll make your head spin! Thanks RiffRaff for the best parts, at the best price, and of course the best service.

I used this filter as part of a custom intake build I did on my 7.3L Excursion and it has been awesome. The increased airflow over stock is evident from the truck letting out almost no smoke when accelerating hard on a mild tune, and from the sound of the air moving. The filtration seems to be good; I have yet to see any dust/dirt in the turbo, and have shaken off a fair amount from the outside of the filter. It looks great too on its own or with the riffraff filter cover, which I also bought.

Reliable product, great price, always order one when I order from RiffRaff.

Used my aftermarket intake tube and had to remove box just to make this big thing fit. But with this filter and bag I am very pleased!

Packaged very well, price blows Napa out of the water. Will be buying from here again.

I live in Outback Australia and the 6637 look after the big old Power Stroke just fine. Every 500 give them a light blow out from the inside and then the light globe test and I use the Riffraff covers and the combination has been a winner. Thanks Team.

This thing is huge. Barely fits between my battery and my fuse panel on my '96 F250 PSD. I opted not to go for the kit, as I had a spare piece of 4 inch exhaust pipe laying around. I used a straight piece and was able to twist the rubber connector to make it fit well. Great product, need to pick up a filter bag now!

It also is more economical than stock. It lasts longer than stock. Increased responsiveness. 1995 F250 OBS

Sounds really good, fits good after trimming air box, engine is more responsive, great price, highly recommend!