1 - Exporting from Canada to USA. Vehicle must be 3 years old, Manufacturers Date decal must be legible (this is the silver sticker on the inside of the door for cs coupes other BMW's center door post drivers side, a bill of sale showing amount paid this is so the customs can calculate tax payable at that moment. keep CDN plates on vehicle.Yes a little trust is required, take vehicle to local garage for a state approved inspection, once passed take certificate customs papers and bill of sale along with a certified copy of the vehicle registration to your local dmv office.pay state tax and your all done. 2- Importing to Canada, same three year rule applies the vehicle certificate of ownership or a certified copy with an affidavit, a bill of sale- again for customs tax pay at border, again a goverment inspection at a local garage within 30 days and then finaly ICBC agent who must physicaly sight the vin No's, again pay tax you can buy a temperary permit from ICBC before you pick it up, providing you have the ownership certified copy or the original I hope this helps everyone i have been through the BS a few times and it can be fustrating if you do not have the right documents I know that state law requires the owner who sells a vehicle to return the certificate of ownership back to the dmv within 5 days Turn a blind eye or get a certified copy with affidavit or your sunk ! good luck