I think that is a good point that you can't trust vendors to give the most accurate information. From all the pictures i've seen the VQ37 is quite a bit beefier than the VQ35 which seemed to be good to around 400-450hp before breaking stuff. If you just bought a brand new G37/370z are you really going to risk loosing an engine over 50hp or take it a bit easier and be safe.
FYI the VQ30DET is good for 500rwhp standard but that was an engine engineered for forced induction from factory. As there isn't much actual experience with the VQ37 yet I'd assume the safe limit is in the 400-500whp range.
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