This thread has some good input IMO
https://www.ford-trucks.com/forums/1...ir-intake.html

 

Link to “Secret” Zoodad mod as mentioned in the other thread. I like this hidden version much better than the other. https://www.ford-trucks.com/forums/1...l#post16924907

 

https://www.donaldson.com/en-us/engi.../cleaners/psd/

I imagine one of these models could be made to fit the engine bay? They have CFM ratings so a matter of finding highest CFM filter that can still fit.

Given this is the same tech as the AIS and 6.0 filter, should be pretty quiet?

 

I am just adding some more opinion and rough data here.

I recently installed a 364.5/68 with a .83 non gated housing to go with my 200/30 injectors. I have 1 tune on my Hydra which is an "80hp performance tune"

I love my AIS for its quietness and filtering capability, and for the lifetime supply of filters I bought the other year when they were on clearance for $10 each, The AIS housing has been unmodified until recently, I decided to try a few things and see what happened.
I have CCV hooked up to factory position, and see zero oil consumption, some people have mentioned concern from the AIS restriction and oil being sucked from CCV

Unmodified AIS- 364.5/68 .83 pulled minder almost fully at heavy throttle mid 30psi of boost run
Did the fender mod- pulled minder half way at heavy throttle mid 30psi of boost run
Added a 2.5" hole in bottom center of housing along with the fender mod- Did heavy throttle run to 40psi of boost at 90mph (boost:ebp stayed 1:1 or better up to 39.3 of boost) Then towed 13k 5th wheel on steep back roads 120 miles in 90 degree weather. Filter minder barely moved 1 notch, egts stayed below 1,200, absolutely zero issues. I will never get rid of this AIS as it helped keep turbo whistle completely silent on the intake side, I also have an S&B which is my favorite behind the unobtanium AIS, but the S&B has more whistle in the cab, which I do not enjoy on long trips, plus I dont wanna buy filters for them when I have 25 AIS filters in my storage.

 

$10????!!!! Quiet...yes yes yes. ME love.

 

That is awesome news. Mine is still serving me well. The 7/7 wheel whistle coming from the 6637 in my 97 gets kind of annoying. Anyone ever put an AIS on an OBS?

 

Good stuff Eric! I hope to summarize your info in the original post so it is readily available to folks and doesn’t get lost until the pages of the thread. Thanks for sharing.

I too love the AIS.

The $10 deal was a rock auto close out that someone here shared with us. They were Fram filters but too good of a deal to pass up. Seems like I ordered 4 for like $50 shipped. Y2K went into some good detail about the differences in the Fram vs Donaldson. IIRC the main topic was the way they’re made means the Frams won’t last as long without causing a restriction. But it was way too good of a deal to pass up.

There’s always a pioneer. You can be the first. Everyone told me the AIS wouldn’t flow enough for the SXE turbo. It has its limitations but sometimes it’s worth the trade off. Or in Eric’s case he’s showing us the box is the main restriction and can be modified to compensate.

 

Did I read somewhere (maybe in this thread) from Y2k57 that there was some sort of engineering built into the way the box was molded to more evenly distribute dirt into the filter?

 

I believe so. Not sure if it’s in here but the information seems familiar. He has a lot of good knowledge about the AIS.

But sometimes we are willing to give up some of that filter life engineering to gain performance, or the ability to use the AIS with our modified trucks.

He is also not a fan of the fender mod but it really seemed to help flow in my “no filter” box testing. And that data seems to be backed up with Eric’s results. Again, a trade off some are willing to accept.

My biggest thought/concern about the center hole Eric added is the loss of “cold air” only. I know that’s a touchy subject that causes a lot of arguments but most folks considering the AIS prefer the cold air aspect. It’s still getting “mostly” cold air. Again, each person needs to decide if this is a trade off they’re willing to accept.

What would be awesome is a trap door that seals until the box restriction opens it up. Best of both worlds. But realistically it’s not worth the effort for a small change in IAT.

 

2.5" center bottom you say? I already have the fender mod. Just added the 363 68.91 and just ready to do the air box. Perfect timing. Thanks for the testing info.

 

One thing to note, for me it was modify my box, or get rid of the ais. So I will take the tradeoffs from modifying it. Not too worried about a bit of warmer air getting sucked in, seems to make a very negligible difference, as egts stayed below 1200 easy in 90 degrees towing a 13k trailer up %9-10 mtns with egts easily below 1200 and a lot of extra power available whenever desired, in a performance tune with 200/30 injectors

 

yup, I would start with the fender mod and see how it does before running a hole saw through the bottom of the box. The least modified needed is always ideal in my brain

 

Good information...still looking for the metal battery trays to get them installed on our 2 trucks. One of the oem original units is bad enough I may cut the plastic battery tray down and use it. I have a lead on a few F150 units that look the same...just have to put up with the hold down being bass ackwards towards the cab...

That wouldn't be too hard to accomplish in my eyes. Cut a rubber flap from a thick inner tube...maybe semi-truck or tractor...with a flat edge ("D" shape if you will, on one side to mount 2-3 screws with flat washers, or make a long rectangular shape to cover the edge side to side. I would mount the flat edge part of the piece towards the intake inlet from the front of the truck so it doesn't get lifted open. It's just a matter of getting the material right so when additional suction comes into play from said boost, it lifts the piece on one side and allows more air...

 

Thanks for linking this thread for me Jason, I wanted to follow up on the AIS fender hole mod mentioned here.

I finally had reason to pull my AIS. Not a good reason; CA smog finally noticed my Mishimoto IC. Passed smog inspection 6 times, but not 7. So I had to install an OEM IC. Sourced from one of the many Rancho Cordova yards $125.

The job was way easier 13 years ago.

So I had the usual 3" hole in the side of my AIS. Decided to cut the opening lower to allow flow more directly under the filter and not only to the side. I think the pics are self explanatory. The original hole plus the recent cut out.

 

What is a mishimoto IC?