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I test drove a 350Z with the S tune suspension and thought it was a rough ridin SOB. Just my opinion of course. I'd hate to give up the ride my G35C has.
I think if you were really in to auto cross or if you just wanted all out performance then it would be good. I'm sure its the same way when you do tein, hks or some other make of full coil over's. I talked to a guy from Everythingg35.com and he said they have the full hks system on their G and it rides rough as hell. But it handles like a dream.