[nieuwhzn]

Originally Posted by Nimbus117

Have a look at this thread, I may not bother with the front engine mount now:

Boxster 986 vibration @ 3000/3200 rpm (fix?) - 986 Series (Boxster, Boxster S) - RennTech.org Forums

Well, you should bother with the front engine mount anyway. The rubber in these things deteriorates pretty rapidly. I decided that the 3000rpm vibration was getting a bit too much and replaced the mount, the rubber was actually ripped in a couple of places. With the new mount there is only some vibration left when sitting around 3000rpm with an unloaded engine, like when decelerating.
Interesting article on RenTech, pity that the 'final solution' was never handed to us. Could be that the exhaust system is the culprit or at least amplifies the vibration. A good check would be to see if people that replaced the stock exhaust still have the same 3000rpm vibration with an unloaded engine.