The book you are probably referring to is Pellican's book and they planned to bring out a bearing replacement kit using the same design parts as Porsche originally did.
Certainly the IMS issue has been discussed to death on the forums. Can it happen? Yes. Expensive if it does? Yes. Happen to every car? No. Any way of predicting if it will happen to yours? No. Any facts about how often it occurs? Probably not even Porsche knows. My guess is around 1% probability per car year. If that is the right guess, would you rather spend money potentially preventing a problem with that probability of take your chances?
further information at lnengineering.com and flat6innovations.com
Only you can figure out how much you are willing to spend on preventative maintenance.
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