The Stock intake manifold is going to start to be questionable around 800rwhp... Also boost is going to be relative to each build the turbos on the build and supporting mods.
However, if you are comparing block to block I know the regular built GTM Motors and ones built by Speed 4 Sale have handled deep into the 20+ psi range.
If you go with one of the more built motors like mine then you will need to be looking at other supporting mods to truly take full advantage of their capabilities. for example I run a GTR intake Manifold, I have built Heads and etc...
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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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