Porsche made some really questionable engineering choices when designing these engines (IMS). But generally speaking, as time went by, they refined details with the cars and updated component designs (with one exception, the IMS; going from double row to single row bearings). When you order parts you see that there are superseded part numbers in many cases.
The company has a tradition of refining designs, such as the 911. I really don't drink the Superior German Engineering Kool-Aid, but in Porsche's case, I do think that they try to address their mistakes as time goes by.
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