the 350z has harder suspension then the 370z due to the fact that it needs it.
the 370z's chassis is much stiffer in all aspects and thus for the street you can soften the suspension up quite a bit.
put some stiffer springs on it and you'll feel the difference from 350z to 370z.
also the european models of japanese cars get softer suspenion than the usa and japanese.
japan has great quality smooth roads. the USA and UK do not.
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