+100000000 on if its a replica or authentic! It's obviously JDM style and it seems to have good fitment.

Very original with the paint scheme. I think it works especially well since your car is white--makes it looks much more aggressive. I would also suggest wheels over the hood for now. Look into the Rota P45 as a cheaper alternative to the Nismo: https://my350z.com/forum/showthread.php?t=146113