since i also mention this another thread...lol...here's some more details to it.
these are by far the best intakes for the G37 right now, the Injen one was a total struggle and no one liked it cause it didnt make much Hp gain at all !!
these intakes made a good amount, since the engine is the same on the new Z, Stillen would probably just need to design the outer pip part so that is fits behind the new bumper/grille of the Z.
a vid for it ( I believe that that car in the vid has exhausts and HFC's also)
I'll try and find more clips that doesnt had such a modded car in it
here is Stillen dyno sheet (I'll find others from customers)
and pics to get an idea
Stillens web page
building some hype here, dont forget to give me some rep points