Too Loud. I Thought Turbos were quiet.

[Rhino]

It sounds as if he's already ruled out the blow off valve. If it's happening at idle, I doubt he's under boost. In your video, it seems that it's only happening under high boost conditions once the driver backs off the throttle, or shifts. Of course without hearing a sound clip of this particular car, we're all doing nothing but speculation.

I've had the "crickets" in a pretty stout solid roller 468 big block running on Methanol. I always associated it to the overlap as well. Occasionally I'd hear it when it was running a little lean. As strange as it seems I always noticed it more when the engine was cold. Maybe that's simply because I was paying more attention to it at the time.

[B's Nova]

No problem. I just wanted to throw in the wastegate as being a cause as you can get similar sounds from it as well.

[Rhino]

Like I said, we're all just speculating. ;)
Whatever it is, I'm interested to see if we find the culprit.

[77thor]

I'm running DynoMax Super Turbos, with headers, 2.5" pipes, full length tailpipes, and an "H" pipe.... it is very quiet.

[35spline]

A lot of people mistaken this for the blow-off valve but its actually the wastgate opening\closing rapidly..

I am hearing the crickets at idle under vacuum conditions not boost. My engine is running rich right now. Actually it is not running at all since I lost spark. When I get it going again I will post an audio and or video clip.