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IMSb upgrade was in 2005 - mid-year and onward. Failure rate - which was low in previous generations - appears to have dropped by 1/2.
Because the later IMSb-equipped cars were not included in the class action suit, it's mostly anecdotal evidence. But if you look on eBay at the number of Boxster gauge clusters showing 150K-plus miles, you can infer that a lot of those engines are lasting a long time.
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