"It has not had the IMSB done, but I've heard that the Tiptronic's don't have this problem as much, and you can cut the oil filter to check for metal shavings before it goes out. I'm still on the fence about getting it replaced."
There is no evidence to support Tiptronics having a lower failure rate and they are more expensive to have the IMSB replaced due to more hours involved in removing the trans. 2000-2005 Boxsters had the highest failure rates so at some point you should have it checked out with a PPI.
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