It should work with oem springs but I would throw down for some aftermarket springs. I don't think you'll need to modify the valves and heads otherwise. If I was doing this I would go into it with springs, cams and most importantly a tuner I trust because this has not been done before outside of Jun.
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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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