I have a 2012 G37 IPL which is the Infiniti version of a Nismo. I have the true dual exhuast setup on my G. I believe that the G is a tiny bit longer so you might need to have a small section cut out so the tailpipes don't stick out from the back bumper. I live in Vancouver, BC and am willing to drive to you or meet halfway at a shop to do the swap. If this is something that you would be interested in let me know so we can set something up
Cheers,
Bryan
Forgot to mention that I have a set of ART pipes that need to be installed on my G at the time of the swap so you can take the stock cats and install them then sell the Berk HFC's to make some cash or keep them on to use with the Nismo exhaust with the option to put the stocks on at any time if you still want a quieter sound.
P.S.
I am willing to drive all the way to you if you aren't up for meeting along the way somewhere