I'm pretty sure that 2013+ 370z'z actually bump to SSP due to a lapse in the rule book. I looked when I upgraded my clutch a couple months ago. Was miffed that I was classed with stock GTR's and Ford GT's (not that there are any in my region but its the thought that counts)
http://cdn.growassets.net/user_files...pdf?1445897824
page 22
Nissan
370Z (all) (2009-13)