Can some one help please?

i'm getting a strange noise (buzzing) in all gears and neutral when accelerating between 1500 -3000 rpm. when the engine is held any where between this range the noise goes.


1999 A4 2.8quattro manual

 

well i have the same issue and for me its a loose heat shield above the muffler buzzing away.

 

does the noise become higher pitched as rpm increase?