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Enough failures
that Porsche concluded that an IMS design was not a good idea after multiple designs had problems to some degree and so designed the IMS-less engine.
Enough failures that Charles decided there was a business case to be made for designing a IMS return and refurbish business even if the cost to the car owner would be significantly more than the earlier design simpler bearing and seal replace..
Those two decisions by people in the know would convince me there was some risk in the last IMS design.
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