My understanding is that the Tips are more susceptible to IMS failure only because they tend to be driven at lower RPMs more often than the manual gearboxes.
There is a correlation between lugging the engine and IMS failures. Slushboxes just shift at lower RPMs in normal daily operations than drivers that don't like to drive their cars below 3000 RPMs.
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2001 Boxster S 3.6L, Zeintop
"Calling upon my years of experience, I froze at the controls." - Stirling Moss
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