Welcome!
From a quick search, I honestly have
not seen a 370Z make more than 600whp (stock block). The highest boost is no more than 12 PSI. Take a look at the torque curve from these motors as the boost gets increased... interesting?
500whp
The Specialty-Z GTM Stage 2 Build
GTM TWIN TURBO kit: 2009 370Z 539WHP/490RWTQ-WATER INJECTED TORQUE MONSTER
Gtm 370z twin turbo transformation 548rwhp 486rwtq @ 11 psi
However, this is probably the most I've seen from a VQ37 stock block:
GT Motorsports: GTM Stage 2 TT G37 Coupe, GTM 3" Cat-Back, GTM Flash, 611RWHP/474RWTQ