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[dhirocz]

That is interesting.

I bet the new prostars have that elbow where it passes into the intake duct to help direct air into the compressor, like some of the isx's do. Point it into the airstream and it should lessen the vacuum compared to just teeing it into the pipe.

Good points made here. Now I'm curious and want to call wabco about that, and see if they have a reason it's different on the new prostars.

One interesting thing to note, I put some lube into the inlet of the compressor...no more noise. Whatever the issue with it is appears to be in the compressor head. It's still going to get replaced, if nothing else, based on mileage alone. I'm also interested in this parts rebuildability.