Importing/exporting project to Canada

We've brought a few back. Fax a copy of legit title to the US border crossing where you will be bringing the car across. This has to be done 72 hours previous to you coming to the border with car. Print off the fax confirmation and bring that with you as well as bill of sale, current title. I cant remember if seller has to sign the title or not?? Seems to me that it SHOULDNT be signed, but double check.
Also the fax you send to border crossing, make sure you put your name, address phone number etc on it.
Take enough paperwork to choke them. We had ZERO hassle from US side. All issues were Canadian side looking for tax $$.
We didnt require a broker as we brought the cars back themselves.
Here is transport Canada link
Importing a vehicle - Transport Canada
Link for US info, and list of crossings.
Importing a Motor Vehicle | U.S. Customs and Border Protection