[JFP in PA]

Sometime in 2005, Porsche switched all engines over to the "final solution" style IMS that requires total disassembly to update. Unfortunately, the only way to know which cars/engines have this style bearing it to look at them; if they have the 22MM center bolt, you cannot update them.

There is no other known way (e.g.: serial numbers, dates of manufacture, etc.) to determine what you are dealing with.