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I think you can infer from the changes that Porsche was trying to make an existing design better before they had a scheduled major change which eliminated the IMS in '09. There have been varying designs with varying characteristics through the '97-'08 model years. And the last IMS may or may not be better but is surely much more expensive to replace. So newer is not better in the case you posed...the "I'm going to replace the IMS" case..
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