Is there truly no way to tell that it’s time to replace the IMSB?

[Starter986]

Originally Posted by cantdrv55

There has to be some tell tale sign that the bearing must be replaced otherwise, 100% of Boxsters and 911s of a certain vintage have to get this work done. Didn’t Porsche claim only a minority of cars are afflicted with this issue? How can they know that if there aren’t signs to foretell doom ahead?

Remove your airbox and cut it open. There should be a sticker inside that will illustrate where under your car you should look for the hanging tag that will identify which model IMS you have, and how to remove and inspect it.

Or, follow Particleweave's advice.