I’m guessing seized.
Who’s oil feed kit did you use for the valley turbo again?
Is the lift pump running and working?
Prelube the turbo before you fired it up?
Well, that sucks...
Now your going to feel uneasy about the truck, I've been there, bad feeling. Your right about stock trucks, but they aren't much fun now are they? Hopefully, you will get it right here soon...
I'll bet it just blew off a charge tube. They don't make a lot of noise once a boot is completely off. I've destroyed a few boots over the years, and your first comment points in that direction.