Safe amount of HP for stock engine?

NYBladeZ

I think the reason why we havne't seen a new intake manifold is that the OEM one is up to the task. This past summer at vinny ten's bbq he told me that the manifold is solid and probably won't need replacement for atleast up to 600hp

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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