Sorry to hear man :/
That shaft not being a one piece-machined part, with chains flapping on it all day long, occasionally at above 5,000 RPM.... not sure about your knowledge RE rotor dynamics but I wouldn't look elsewhere for the root cause of the mighty IMS failure.
I've never seen a IMS mind you, however I can tell you that high speed shaft/rotors (>5krpm) ARE and should be machined "one-piece' for an effective and durable TIR. Truly poor of Porsche if they haven't.
** Certainly not caused by a lubrication design flaw otherwise, like I said, most if not all of the 9X6 would be dead today ** Just using common sense here
Again. sorry to hear it happened to you. Not saying that 60k is definitive "passed threshold" but sure you know what I mean by that.
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'97 Boxster base model 2.5L, Guards Red/Tan leather, with a new but old Alpine am/fm radio.
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