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Unfortunately, the only way to inspect the IMS is to pull the gear box, and then remove the clutch and flywheel. Many Porsche dealers still are telling people that the only way to change the IMS bearing is to split the cases (total disassembly of the engine), even though not just independent shops, but backyarders are pulling them from fully assembled engines and replacing them with the LN unit.
Two things to consider: If the IMS bearing had be upgraded, it would have been a featured selling point when the car was sold; dealerships (in general, as LN has won some converts) would not change the IMS bearing, they would replace the engine.
You can also check with LN Engineering to see if you VIN is listed as having been upgraded…………
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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