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The 99 years had dual ROW IMS, which made them very unlikely to have IMS issues. Of course a very small percentage had issues, but we are talking less than 3% of all cars. If it's been done, great! If you want to do it for peace of mind, go for it. However, it's not necessary on the 99s.
How do I know? I have a 99 and have had it for almost 20 years and I'm on the same IMS bearings. No issues. 65k miles is relatively low. Best thing is to have a reliable Porsche mechanic do a PPI on it.
Good luck!
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