Had the cheap 6637 filter on my old 7.3 put the expensive one on my new 7.3 and wow. You can hear the turbo wayyyyy more.

Great item easy install trimmed original air box fits great

The fit was awesome and shipping was fast I would definitely recommend to anyone.!

I opted for the Donaldson filter since I live on a dirt road. Can definitely hear the turbo way more with this kit. Had to cut the back of my battery tray just a bit to get it to sit right and the hood to close. Would recommend!!

Turbo very noticeable once installed. Moves lots of air. Very pleased with the price too!

Other than removing stock airbox ( i had a stripped bolt that slowed me down) install is a breeze just hose clamps. Unfortunately I did several mods/maintenance things at once so I cant say how the performance changed from just this filter. I do think my turbo sounds better and I'm sure the increased airflow is a major part of the performance increase I did get. I also changed my fuel filter , did oil xover tube, ebp tube and sensor, changed oil, transmission fluids, both differentials, transfer case fluid, and the filter screens in the tank. I got some power back in the ol girl ( my new to me/old 1999 f350 I just bought). I'm very happy with choosing this product over a cold air intake. All The riffraff parts ive bought dropped in just like they should!!! Waiting on more funds to get the fuel crossover , banjo bolts, and new fuel lines with cvd fittings. And I'm thinking of replacing all the intercooler boots with riffraff parts as well since I have no idea when maintenance was done on this truck I'm trying to replace all the decayable parts as soon as funds allow.

Improved MPGs by 2.0! and sounds nice!

Super High quality of the blue filter, fast shipping and can actually hear the turbo now.

Filter kit is what advertised. My 7.3 with a small programmer really likes the extra air. Not sure it likes the high temps at low speed or idle but it’s my opinion that temp drops at speed.
You can light a check engine light at will as the turbo boost will hang out at 25/27 with wide open throttle. I didn’t buy it for a hotrod but a pulling truck, filter kit helps with that. Appears to help with performance pulling my fifthwheel.