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If it were the IMS bearing it would sound like shaking a can of ball bearings the engine would stop running and most of the oil would be on the floor.
I was reading about vibration on another thread. There it was suggested that one of the variocam adjusters may have failed causing the valve timing on one side of the engine to be out of phase with the other. His vibration started violently at ~3k RPM.
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2013 991.1 Carrera S Cab
2004 996 Turbo CAB X50 sold
2003 996 cab 6 speed Sold
1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold
DE instructor since 1985
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