Go with the stage 2!!! With a stage 2 you have more room to grow... I am running 12 psi on the stock block and pushing just over 600rwhp daily! It's worth it for a few hundred more  
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Shop Cars: 2013 318whp Nismo VspecII 370z *SOLD*, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054
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