3k RPM Vibration solved!
Finally, the vibration a 3000 rpm seems to be gone after some trial and error.
First step was of course a new front motor mount. This did nothing to solve the problem. Next attemt was the dual mass flywheel, vibration still there.Then finally, after fitting my new bypass-pipes to day they seems to be gone. I have so far only tested first and second gear but on the other hand it was worst in lower gears.
To me this solution makes sense as I have noticed earlier when changing muffler that the vibrations also changed due to different mounting height.
Also, this is not a common topic on the european Boxster forums. Probaly due to those cars only have 2 cats.
When the rain stops I will do a final test to see how the sound and powergains are.I do not expect to feel anything more than a few hp increase.
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