engine "noise" at 2000 rpm only?

[Vitalie]

Ok. I thought to keep you guys busy and post an other mystery that my car possesses. This time is a strange sound or noise that comes from the engine. It happens only at 2000 rpm sharp. Past that is fine and before that too. Moving or stoped.

some kind of vibration that makes this noise, not sure.

Here is the video. You should probably crank up the speakers to hear it better.

http://youtu.be/KOPK0SgbHPA

I had this crazy thought that it may be a designed feature , a feedback from the engine to let you know it's time to shift. I know some cars have a light in the dash for the same propose.

Dose anybody else have the same "feature"?