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Where's that filter minder line plumbed to?

This is the 8.3 cummins. Starts coming in around 16-1700. Comes in loud between 18-2100. Soon as the trans shifts it goes away till you get back in the turbo power band again. Can't reproduce it with the truck sitting and tromping it to the floor. Only under load driving. Never heard anything...

I have a 1990 931A2 that was a rebuild. I've found bad grounds, air lines crossed on the transfer case and some plugs not plugged in. BUT I have a loud air leak under the dash that starts at higher rpm's and gets very loud when the turbo spools in. It appears to be under the driver side and I...