I started the last large in depth discussion on this issue, can a 370z hit 400whp.
The general answer was at the time, no. I would still agree with that answer, there are not enough parts available and betting on when/if they are released is up to you.
A stroker kit will get you closer to 400whp, but still no guarantee but going that way you are throwing a lot of money for a naturally aspirated engine with an ECU which has not been fully utilized yet.
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