Good instructions, great product and love the filter sock high quality and looks great

Better airflow, easy to install, looks great, more turbo noise

Quality parts and accessories and sounds great only reason it’s not a 5 star is because I ordered for the early 99 as my build date says and intake pipe was wrong but made it work

Wish there would of been some direction as what to do with sensor from the stock Airbus. Nothing that a lil surfing the net couldn't fix but a sheet of paper saying hey you need to do this would of bin nice *found instructions to download in the description

Ditched the stock air box! Should have done this a long time ago. Truck performs and sounds better than ever.

Excellent quality, fits well, highly recommend

Order Friday afternoon, it was on my doorstep early mon morning. Honestly didn't think I would notice much of a difference from my K&n, I swapped out the old filter for the new 6637 kit, which was as easy as loosening a few screws, the cover looks great, I went for the black one, as after I got it tightened I took it for a spin, let me tell you, I was pretty freaking shocked actually, my 96 7.3 dually was a little slow off the get go, now I can actually feel the turbo getting what she wants and the boost is awesome, definitely buy this product if you are questioning it!

Does a nice job at using the 6637 filter. The pre filter sock is a nice touch.

As always, riff raff always impresses me with good quality parts, excellent customer service, and quick shipping. This filter (the Donaldson blue) not only looks good but out performs the k&n filter that was on the truck prior to me buying the truck. Touches the hood a tad but hasn’t given me any problems. If you’re concerned with it touching you’ll either have to cut away some excess plastic or buy the aftermarket battery shelf. Overall great product and gives your truck a little more turbo sound and a little more power.