The dual mass flywheel was actually carried over to the 993 and you are right it was improved in the late 92 /93 models as well as a change in the rear pick up points of the suspension. However with so many years since then all the owners that had that problem have already updated the clutch/flywheeel under warranty when they had the problem so it should not a present issue to speak off. In any case an RS lightweight flywheel/clutch plate combo should be a high priority on someone's list to upgrade to as they make significant improvement in performance on both 964's and 993's. I have changed these items in both my 993's before they needed to be replaced just for performance gains.
A lot of people go for chips for performance upgrade and mostly they waste money...
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