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					Originally Posted by  10/10ths
					 
				 
				....has some sort of catastrophic failure mode. 
			
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Yep.  I don't understand why people (mostly non-Porsche owners on general car sites) make a bigger deal about IMS than any interference engine timing belt failure.  Doing nothing about it is far less risky than not changing a timing belt, and if you do choose to address it, it's probably going to be only once AND at the same time as some other major maintenance.