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From another thread:
There's an issue in the 3000-3300 RPM range with the dual-mass flywheel that's standard on the Boxster. I feel it all the time, mostly in the seat. Mine started a few months ago. The problem is similar to a warped rotor, but since the flywheel moves so much faster it's a vibration you feel rather than a shaking like you would get from a brake rotor. The range widens over time and mileage.
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