If anything, you could get the Nismo styled high wing. Looks similar to the Nismo, but a little bit wider and taller, although I'm not too sure how that affects aerodynamics. Possibly an aerodynamic gain, but without the attention a GT wing draws.
Not sure if this link is still relevant but here's some more info:
EVO-R 370Z Highwing
Might be outdated so just look around.
Another link, same wing, but on Amuse rear:
http://www.thezstore.com/page/TZS/PROD/50-1885