It will not bolt up directly. The 370z midpipe is shorter.
Just an FYI, I wouldnt put the 370z exhaust on the ex35. Im guessing you want a nicer sound to your exhaust ?
This is my setup and others have done it with great results too. Nice growl to it but its not annoying on the highway.
EX35 y pipe
EX35 mid pipe (they are small diameter pipes but sound better than the g37/370z surprisingly)
G37 rear muffler
You can try just the 370z rear muffler can, that will be direct bolt up. Tips are recessed a little but it looks nice in the EX35 bumper, same with the G37 exhaust I got.
Sound clip
[youtube]
http://www.youtube.com/watch?v=s5ViOHRV52M[/youtube]
P.S. Ive tried the 370z midpipe and y pipe and it was quieter overall. Had the 370z resonators cut, then it was super loud but annoying in the highway, sounded like a fart can revving too, you dont want that from an infiniti lol.
Cheers
-C