Just a thought.... what if you pulled the spark-plugs and rotated the engine by hand.... listen/feel for any roughness or rubbing. If there is some then pull the serpentine belt and rotate again. Like Eric G mentioned could be a bearing on anything connected to the engine. Maybe focus on those items closest to the driver side first. If you feel no rubbing without the belt then check all the items driven by the belt. If all that comes up negative then it possible the IMS sprocket moved during the IMS bearing install and is rubbing. If that happened then it's probably 'pull the engine time'..
Wish we could help hands on.
Boxster
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