Might be using the wrong terms but here goes. My third CTD and this is the first one where I have noticed what I would describe as a whistle noise when I am under a heavy boost. No gages but mid range RPM turbo has spooled and I have my foot better than 70% into it. I know the turbo whine well etc. this isn't it. Sounds almost like an air leak.

Any thoughts on this one? Would be nice to hear from you folks before I go around and around with the dealer.