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Virtually everything I've read says that it's a good idea to replace the water pump and IMS bearing around 40k miles. Particularly when doing a clutch job. If that's not a preventative change I don't know what is. Have you read Issue 97 of Total 911 from? There's an article written in collaboration with Hartech (the UK's leading Porsche engine rebuilder). Their technical director is a former GP engine builder.
They say the same thing. The only way to AVOID an expensive engine replacement or rebuild is to preventively replace the IMS bearing.
I'm just not in your camp on this. I can't/won't defend Porsche for a totally deficient design that they wouldn't even stand behind until the class action suite made them.
The 2006 through 2008 design will fail. Maybe just not at the same rate. A bad design is still a bad design and I won't defend Porsche.
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1989 Carrera Coupe
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