After a long drive when motor is good and warm (around 210) when I make a complete stop the turbo (I belive it's the turbo) makes an odd sound while spooling down.
I sounds just like a power steering pump with no fluid in it. I checked the power steering fluid and it's fine.
It also makes this noise (not as loud) when starting out (0-10mph) only when it's good and warm.

Is this normal?

Also since GM did not put a turbo temp gauge in does the computer know when it's to hot and shut it down automagically?