Strange sound at 6000rpm in every gear?

Alright people I've got a strange sound in every gear at 6000 rpm does any know what it could be? Thanks
 
Probably just vibration of the dash etc. when the pitch of the engine note gets to a certain point. Just a suggestion. To be honest, I think mine does the same thing.
 
if its the same as this don't worry I've had that noise for 2 years now..

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