[thstone]

Agree with MikeFocke. Wait until you need to replace the clutch and then replace the IMS if its really bothering you that much.

The majority of Boxster owners never replace the IMS bearing and the majority of owners never have a failure. But if it does happen to your car, then the engine is likely ruined. My best guess is about 3% will ever fail.

Another way to look at it is Porsche has sold over 200,000 Boxsters and there have only been about 2,500 replacement IMS bearings ever sold. You can do the math, research the problem, and come to your own conclusion.