I have a theory on the IMS failure

[roadracer311]

I've thought for a while now that lugging the motor probably contributes to the RMS failures. Explains why the tips fail less often (the production numbers for tips are higher than you might think, or at least they were prior to 2007 when I was researching to buy mine.) So it was interesting to see some history (from Quickurt) of lugging a motor leading to roller bearing failure.

It would be interesting to know if Porsches in countries with higher octane fuel also have the same level of RMS failures. Lugging can also cause pinging (even with a car designed to tune on the fly to eliminate pinging). Pinging can send all sorts of forces and vibrations through a car