^^That is true. Contact patch will be the most important for performance as well as a good set of coilovers. A wider track is ideal, but accomplishing that with spacers isn't ideal. Small spacers wont make much of a noticeable difference either way.
Its a little early to tell the ideal setup for the 370Z since I haven't been out to a track with it yet, nor have I experimented with tire/wheel combos. Just stick with something that allows you to get a big enough tire to suit your needs.
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