The rare Nissan is most likely a Skyline. Which those cars cand have titling problems these days on their own due to an issue with the company that was importing them and doing the federalization/making legal safety wise etc for america. Even if they were legit when they bought them. One of my best friends has one of the few legal Skylines in America here in Ohio.
http://www.youtube.com/user/tyndago#p/a/u/2/1OLx_j92o-g