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On a straight six like a BMW I'd never put an undampened UDP, totally negative effects.
On the other hand I have one on my 1.8T Audi for years and years now, no ill effect. First shorter crank, 2nd here in the US one never drives for extended period of times with high rpm like on the Autobanhn where you'd go pedal to the metal for hours at a time. That would be a bad idea with an UDP!
Maybe not Boxster related but on my last aircooled Porsche ('90 C2) I had a lightweight OEM flywheel and clutch (RS parts). So no more dual mass damping there.
For above reasons and 'cause the crank on our cars is rather short I will go with an UDP. And if the clutch wears out (I doubt it) or the DMF goes kaputt I change from an UPD to a light flywheel/clutch setup.
Besides, I drive the Boxster for maybe 5-6,000mls per year-if that-, for the engine to wear out faster with the UDP it would take me how many years???
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'14 Boxster
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