Curious about this since I'm nervous about the noise of a 38R. How much boost will it pull through the AIS? Which injectors do you have? Have you tried to open up the AIS any?
With a new ais filter the best i could get and that is with a tune was 21lbs of boost with the blue replacement. My old mechanic replaced it last time with an expensive but cheap white one. In which I didn't know they made. But the problem I see it it's pulling so much the ais is too restrictive and gets clogged quick and goes from being restrictive air flow with a new filter to being choked with it mildly dirty with the indicator always sucked in.
Right now with it dirty but really not horrible the best is I think is 14-15lbs of boost.
I thought I had bad injectors because it is being choked so bad going up hills and hwy driving I can feel it chugging or missing.
My new mechanic checked everything and just wanted to see if it was the filter restricting the air flow. So all he did was pop the tabs on the filter cover and it jump up to 21-22lbs of boost.
So I just ordered the 6637 kit from RiffRaff. And honestly I'll be happy just to hear and feel the turbo that I thought was supposed to make a decent difference. With the ais I hear about the same turbo noise as I did with the stock. I hear it a little more with the blue replacement filter, whatever this guy put in it now, sucks. I didn't know they made a cheap filter for the ais, but I guess I was wrong.
The filters are $70-$90 depending on where you go, but to me I'm replacing them way to often for that and my gas mileage is pretty bad.
As of now and this may sound odd, but I feel very little difference over my stock turbo with the AIS. I really look forward to the 6637 kit.
I still have stock injectors and no I haven't tried anything to open it up.