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					Originally Posted by Johnny Danger  I feel your frustration . A few years back I went through something similar with my boxster that almost caused me to launch it over a cliff . In any case, as a last step in the process of elimination, is it possible for you to road test another set of oem 18 inch wheels and tires ? | 
	
 
Should have bought a spyder with the vibration resistant option code X414.
 
If the car was error free before the tires it's hard not to indite them no matter what the balancer says. I had a set of goodyears once that vibrated as soon as they went on. I was given the same information as you "it's not the tires". As soon as the car received a fresh set of tires the problem stopped.