IIRC there is a new G37 coupe coming out soon and I think it's safe to assume that any engine upgrades the G37 gets will be coming to the Z next. The VQ37 isn't only used for the Z, it's used on several Infiniti models as well. If Nissan makes improvements to the engine for Infiniti, it shouldn't be too hard to start putting those same engines in the Z.
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