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If it were me, I wouldn't worry about the IMS
1 It really is a very small % that have had failures
2 While it can go at any time, from what I understand (YMMV) higher mileage cars have an even lower incidence of failure
3 Cars with Tips have a lower incidence of failure
There is lots of FUD about the IMS. Some people replace them for piece of mind and most owners don't replace them. Its really up to you. One train of thought is that if you are dropping the trans for any reason, its one of those "While you are in there" things to do as the labor to R&R a trans is high (IIRC 8-10 hours), so the additional cost is parts and a little labor.
I tracked my boxster and has the original IMS with 100K on the clock and my 996 has 105k and original IMS. I don't lose sleep thinking about it
YMMV!
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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