I say run a TT kit with e85 for maximum safe power. I know e85 provides less mileage and efficiency but if you can get around that do it. If you want a more "mild" build, I'd go GTM stage 2 s/c. We've seen Z's hold 500whp but as usual the tune must be spot on perfect. The GTM s/c won't cause you to push the limits. So to answer your question, yeah I'd say the motor is strong enough OEM to handle your "entry" level power desires. You'll need to upgrade the clutch and csc though.
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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling
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