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I am not sure. My buddy put the D turbo back on and gave up on troubleshooting. I thank everyone for their input.

He has swapped back to the D turbo, but here is a video illustrating the turbos sound. https://www.youtube.com/watch?v=lWkiUHgXKoc&feature=youtu.be

Which turbo you running?

Nah, he likes the sound of the C turbo, so I figured I'd try to help him figure out what is going on. Its either gotta be the heat(egt) or oil supply.

One of our members has had 2 different "c" turbos on his truck. The first one made a goofy noise at higher egt/rpms. It went from a whistle to a sound similar to a dremel tool. After a couple months he took it off and found the bearings were shot. He got another "c" turbo from ebay and now its...