Well, in regards to the legal route, here's all the import info:
http://www.nhtsa.gov/cars/rules/import/This is specifically for Canadian vehicles import:
http://www.nhtsa.gov/cars/rules/import/ ... 262010.pdfIt allows Canadian vehicles (which HAS to be CMVSS approved) under 25 years old to be imported provided you meet the requirements listed. Keep in mind, Canada can import vehicles 15 years or older that do not conform to CMVSS or our FMVSS requirements. Those vehicles ARE NOT covered under the Canadian vehicle import rules. They are under these rules:
http://www.nhtsa.gov/cars/rules/import/ ... 010410.pdfNow, vehicles 25 years and older are under different, much more lenient rules. Regardless of being Canadian or not.