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The engine can handle a certain amount of air/fuel mixture before it destroys. There is a blow-off valve and its function is to release extra air from the system. This creates a whistling sound. All cars with turbochargers can be recognized by their whistling.
"At best, this reduces turbo efficiency and engine power. At worst, you'll snap/shatter turbine parts which may cause secondary fragmentation damage."

Press here for a link of a video demonstrating the whistling of a blow-off valve.

More blow-off action.

This is a link to a video showing how ball bearings work.

Loud turbo.