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Boxster engines do fail in ways that destroy the engine. IMSB failures are one of those modes. While nobody seems to know the exact IMSB failure rate, a best guess is about 5%.
You can protect your car a couple of ways. The simplest is the change the oil regularly (~ every 3000 to 5000 miles or once a year whichever happens first) and driving the car as a Porsche should be driven. At every oil change check the oil filter for metal debris that might signal something going wrong in the engine. Installing a magnetic drain plug might also collect any metal fragments circulating in the oil.
The next cheapest insurance is to install the IMS Guardian. It looks for the presence of metal debris in the oil and signals you in the passenger compartment when this happens. It provide an earlier warning than just inspecting the oil filter at changes.
The more expensive way to go is to install the IMS Retrofit. This is a ceramic bearing replacement for the stock IMSB. It last longer than the stock bearings. Many Boxster owners have installed the Retrofit when they changed the clutch.
Hope this helps.
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