If you are importing for racing there are no restrictions that we are aware of – but it is your responsibility to check before importing.

However, if you are intending to register a vehicle for use on roads in the US you will need to do your research. Possibly Nissan Skylines and some Accords can be driven Right Hand Drive (as cars in Japan are) but there will be other modifications necessary. (EPA requirements etc)

Other vehicles may be possible to but would probably need to be converted to left hand drive along with other requirements.

We do not have information on what you can and cannot import, so please do not ask us!

You can find some information on the government website:
http://www.nhtsa.dot.gov/cars/rules/import/