The Nissan Skyline has never been legal in the US for many reasons. Some have speculated the reason for this is the power that can be had in the Skyline is much greater than any police vehicle in the US and the Skyline uses AWD where most police cruisers are set up with RWD. Others feel the Skyline hasn’t been legal here because it has received a negative reputation of being one of the most dangerous cars on the road and it’s not desired in the US at all. Both these trains of thought are incorrect.