How long does it take once an IMS starts to go?

[Perfectlap]

IMS failure is not the only issue with the bearing. Another forum member pointed out something I hadn't thought about before in that a dual row bearing has twice the amount of ferrous material which means the trade off for more integrity comes with more contamination. Many people hold off replacing the bearing to save a few hundred bucks in getting more life out of their clutch but don't consider that the bearing may be past their sell by date. Bumping up the IMS swap, even with just another factory bearing and not the ceramics, not only mitigates the contamination it also provides full utility of a new clutch which you're going to have to replace at some point anyway. A serviceable bearing like that on the 99-05 Boxsters should be replaced as a wear item even though the factory wanted us to believe otherwise.