Question: what year skylines are legal in the us?
Answer: It is because of the famous, or some would say, the infamous 25 Year Rule. The 25 Year Rule is basically saying that you legally cannot import non-US market vehicles that are less than 25 years old. The 25 Year Rule was first mandated in 1988, way before the R33 or the R34, and the focus was not even JDM vehicles.