Have you gotten under the car to take a look around? It almost sounds like a heat shield rattling on something, although why it only shows up at higher rpm is odd.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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