Hello to all, this is a follow up for a thread I posted a couple days ago for my truck making an odd hissing noise. I took the truck to a good local shop, and they said they feel like the noise is coming from the turbo. They're not sure if it's a wastegate or VGT actuator problem, but after dialing the noise in to occurring mostly on gear shifts during normal cruising speeds (mainly at 45MPH) when boost drops ~0.2 pounds before spooling up again it seems to be something with the turbo. I think we all know the stock turbo isn't the best but I have two questions.

Is 18K miles too soon for my turbo to already be having vane/bearing problems? It seems like the noise is happening with a change in drive pressure...

Is this enough reason to pull the trigger on a 2nd gen S400 swap kit and install that in the coming weeks/months?