There are very tough regulations for importing cars. Cars the do not meet EPA and DOT specifications must be made to conform. You should try locating someone in your area that can take care of that. They should be licensed and bonded for this type of work. $4000 sounds cheap to me. If it is that cheap, I might want to get a new Alfa, myself.
Please read over the following:
http://www.epa.gov/otaq/imports/quiktext.htm
http://www.nhtsa.dot.gov/cars/rules/...t06202005.html