To export a motor vehicle from the United States , the exporter must provide documents that demonstrate proof of ownership. In almost all cases, this will be the certificate of title. The original ownership documents, or a certified copy, and two copies must be presented to U.S. Customs.

If you are exporting through a land border port, you must submit the ownership documents to that port at least three days before exportation. On the date of exportation, you must present the vehicle to U.S. Customs to verify that the car being exported is the one described in the ownership documents. The car will be subject to Customs inspection at the time of exportation.

If the exportation is by ship or plane, both the vehicle and ownership documents must be presented to Customs at least 72 hours before lading, at which time Customs will conduct its inspection. The vehicle will be authorized for export only after Customs has inspected it and certified that the ownership documents are in proper order. Your original title will then be stamped or perforated to show that your vehicle was exported from the United States .

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http://directautoexport.com/articles/export-cars/export-cars-usa.html