The law on their website is quite clear. To import a race car (i posted it) its to be used for race purposes only and can only be in the country for a certain amount of time and you must get clearance through the EPA.
Good luck, i had a friend import 10 cars and all were seized and he lost $60000 because they were assembled and he thought he could get then through cause everyone told him it was easy.
Just be aware of the risks