Excellent to deal with answered all my questions quickly. Filter installed easily, complete kit w instructions

Clay @ Riffraff ricks

Fit great, was easy to install defintely recommend

My filter kit arrived in a very timely manner. All parts were included and it seems to be a quality product.

I have had a similar setup on an OBS 7.3 for years, so when I saw this was half the cost I had to get it. Installed it on an '03 7.3, along with the Donaldson Blue filter and the blue cover, and could immediately tell the difference. The truck is breathing better, and I saw an improvement in throttle response. I can't say the mileage improved, but then this truck gets better mileage than most 7.3's I know of. It's well worth the cost, and the filters are not ridiculously expensive like the factory 6.0 filters.

Excellent product. The air flow is phenomenal!

This kit will fit your needs a lot cheaper than other manufactures. It will also save you a lot of time hunting the parts down to make this kit. Yes it does cost a little bit more but how much is your time and gas worth? The finish and fitment of the kit exceptional. The powder coating on the 4" adapter is well done and I seen no defects in mine. The pre-filter is a nice touch. I ordered a black one as to not draw to much attention to it. I am sure the red and blue will always say "HELLO" when you open the hood. I am sure it will put a smile on your face. The installation is straight forward but can be tricky. I opted to make my own battery tray so I could completely remove my factory battery box. To me it is a cleaner install although I loose the "ram air" duct from the factory box. I just not want to cut the factory AIS. The instructions were clear if you need them.

Easy installation and great product for the money. Improved throttle response. No modifications needed, bolted right up on my early 99 F350 7.3

I bought the 6637 Donaldson blue filter for my obs powerstroke. Easy install. Truck can breathe much better, faster throttle response. Turbo spools up faster and has more whine to it. Lovin this intake, just wish I did it sooner. Great customer service from riff raff as always. Thanks Clay

Very happy with the product all around thanks Riff Raff !