The M370 is a stock G35 manifold with the bolt holes slightly modded to fit our lower and is not ported . The Z1 is a ported G37 manifold, and the other one I have is a Stock G35 intaked ported. So a M370 ported. No one sells this so you'd have to buy a M370 500+ them pay someone to port it another 200$. Hope this helps
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14 Q50 AWD, ARK, ECUTEK (SEB), Takda, 
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