resonance

During kick-down accelaration especially up-hill I have an anoying resonance around 3800 rpm. It sounds a bit like ice cubes in a McDonald mug - Could it be from inside the exaust system ? (Altea 2.0tdi DSG)

Guys, I have a really annoying resonance or rattle from the boot... under the plastic cover on the boot the central locking electrics sit on a metal piece of the boot... it Vibrates at different revs and its BLOODY annoying.... have tied a cable tie round it and put tape rond it to no...