Well have not heard of Governor myself, but have heard that cost due to emmissions is normally the biggest hinderance.

Here are some links if you get bored and want to learn more.

http://en.wikipedia.org/wiki/Grey_import_vehicles

http://en.wikipedia.org/wiki/NHTSA

http://www.nhtsa.dot.gov/cars/rules/import/ShowDisplay/sdlist06202005.html

http://www.nhtsa.dot.gov/cars/rules/import/