What did you do with/to your Boxster today?

[pilot4fn]

Originally Posted by rexcramer

Couple of thoughts; do you have a tire delaminating? tire out of balance? loose half shaft/bad bearing? when was your last four wheel alignment?

I doubt that this could be tire or driveshaft or bearing issue, since it shows up only at 3000rpm with all gears (different speeds, but not all the time on any speed).
Alignment was done last summer (no driving on the winther) and in my opinion the issue with bad alignment would show in all speeds or just one certain speed (for example 75 mph).
Mystery continues...