Oh WOW what a difference night and day. Still a stock truck. Feels like the truck is breathing very well. Next exhaust

Looks great, just a little tight against the fender.

Installed this on my 2001 F-250 and threw that K&N filter I've been using for 20+ years in the garbage. The quality was good and took me about 15 minutes to install from opening the hood to closing it. I did go back the next day and make some adjustments because the filter was rubbing against the brake reservoir which caused the brake pedal to vibrate. I fixed this by trimming the plastic tabs the factory airbox bolts to and adjusted the filter so the *top is up against the fender. This gave me about an inch of clearance between the filter and brake boost reservoir.

I bought the 6637 kit for better airflow for my new Stage 1 KC Turbo I also bought here. Kit very easy to install and fits nicely behind driver side battery. I went with the Donaldson Blue, from what I’ve read, these are better than the original 6637’s.
As everything I’ve bought here, shipping is very fast. I did buy 2 as recommended and you can hear the flow when you mash it !

Great filter great kit every minus the clamp drops in super quick it takes all the guesswork out other than the optional clamp, I hope riff raff can keep selling parts everything they do is top notch and I love supporting these guys

Fits great and easy to install. Made a noticeable difference in power and sound

Ordered with the Donaldson filter and filter cover. Easy install. Fits good. Runs great

Working perfect

Simple alternative to the stock filter box with more airflow.