In this video of some fixed up G37, he mentions that he has a twin turbo "nismo N1" kit or something... you can see these dual air exchanging things at the top front of his engine bay, are those intercoolers or oil coolers?
I don't see the normal oil fittings but they look sorta tiny for intercoolers
heres the
video
rest of the car is pretty cool although there seems to be a bit too much going on!