I havent seen much information on this so I thought Id share.
The 2015+ Nismos come with an additional rear chassis brace that mounts in the trunk underneath the main center brace.
It is located in the area where the sound amp and satelite radio units are mounted.
It is also the same bar that comes in the nismo chassis brace kit. It is the black one with red brackets as seen here:
https://www.z1motorsports.com/suspen...it-p-4746.html.
The one that comes on the 2015+ nismos is all black but it is the same bar.
It can also be purchased from z1 here:
https://www.z1motorsports.com/rear-s...mo-p-9282.html
and the brackets here:
https://www.z1motorsports.com/rear-s...mo-p-9281.html.
I was able to find the bar on ebay with the bracket from a car that was being parted out for much less so keep an eye out on ebay or part outs on the forum.
The install is pretty straight forward, I wont cover removal of the trunk paneling because that has been covered in other write ups but removing both sides makes it simple, but I guess you might get away with removing just one side.
After that remove the large foam piece that sits over the sound amp and satelite radio unit.
The bar will bolt to the trunk floor and along the side frame rail area. The 4 bolts for the trunk floor were already there on my car.
The ones that go to the frame rail area were not and the holes were covered with black plugs.
I found the bolts here:
https://www.nissanpartsdeal.com/part...56-8201f.html? You will need to get 4.
These 2 photos show we're it mounts to the trunk floor and the bolts that were already there.
These 2 photos show we're it mounts to the sides/ frame rail area using the bolts I posted the link for.
And this is it installed, I left everything loose until it was all lined up, including the bolts that hold the bar to the bracket. Then give it one final tightening.
I still have to cut the foam piece before assembly. I will update once I do. It's been pretty cold here lately so I haven't been out to the garage.