I grew up in NY so I'm used to northern winters. pTen if your car is not 25 years old it's technically illegal to import it into the United States unless it has been certified for importation. Certification is not easy. There are guys sidestepping this rule and finding ways to register cars in individual states. However these methods are not really legal. If the FEDS find out and they want to make an example for sure your car is getting seized, crushed, and who knows what kind of penalty you might face. Even if you manage to bring the car in then you have to figure out how you will get insurance for it.
I'm not even bothering with the mess. The giant killing JDM cars are already starting to become legal in the US. S13s will be legal next year. GTi-Rs a year after that. Some mid to late eighties gems are already legal. S12s, VR-4s, R31 Skylines, 1st gen MR2s, etc.