Are Nissan skyline gt-r legal in the US now?

No not yet. The Nissan Skyline is currently banned and in the 25 Year import law, which is that people aren't allowed to bring cars over until the model is 25 Years or older. Now in 2014 the Nissan Skyline Gt-R R32 will be legal because it has been more than 25 Years of that model and therefore will be considered a classic car. Now if you are looking for a R33 R34 you'll have to wait for them to be allowed. The R33 ill be legal in 2020 and R34 in 2024, that is for the 1995 and 1999 model.