tensioner pulley and odd supercharger belt wear?
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'99 and '05 E55 AMG
Yikes! Looks like it is locking up and the belt is dragging over it. Loosen the tensioner and spin the pulley and verify smooth and quiet rotation. If you have to change it, check the other pulleys for smooth and quiet operation. FWIW, when I checked my pulleys, three of them were bad....