1) Any vehicle that is at least twenty-five (25) years old (to the month/year of manufacture) is eligible to be imported into the USA, fully exempt of the National Highway Transportation Safety Administration (Department of Transport) and Environmental Protection Agency (vehicle emissions) standards or import restrictions.
2) Any vehicle that was originally manufactured to meet the NHTSA (DOT) & EPA standards, such as USDM cars like a Chevrolet Corvette or European exotic from USA, can be repatriated back to America without import restriction.
3) Any vehicle that is a non-US spec vehicle (Not DOT & EPA compliant), such as JDM cars like a Nissan Skyline, you must hire a DOT-registered importer and have them conform the vehicle to U.S. standards upon importation. * Please check the “list of non-conforming vehicles” (link below) for the JDM vehicle you want to import and also the “list of registered importers” (link below) who might be able to conform that specific vehicle to US Spec for you.
For all of the correct and up-to-date information about the rules and regulations to import a vehicle into the USA please contact the NHTSA & EPA. For your reference, please click on the links below.