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I may have an explanation for the ill effects of the DMF:
Boxster has no harmonic dampener on crank pulley. The Dual-Mass fly wheel serves as a harmonic balancer. By removing the dual mass flywheel and replacing with a single mass, the crankshaft is not harmonically balanced and has excessive vibrations as a result. Even with spring centric hub clutch to mitigate vibrations, it is not as effective as the original application.
I imagine timing could be affected with the system parameters originally designed for the heavy flywheel; all of a sudden compromised be a very light flywheel. I can see why the DMF is controversial - the concerns have merit, but there's no need for such vitriol on these forums.
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