I am a new Carrera owner as well - just brought a 2009 997 back from North Carolina 5 weeks ago- bought it at Hendrick Porsche (great dealer btw). I too live in Toronto - my son (he's 12) and I flew down and drove it back - it was an AWESOME trip for both of us and I can confirm 14 hours in a Porsche 911 is no problemo.
I can also confirm Customs does not impound the car - in fact, if you are crossing at Niagara (careful cause US Customs here is only open 8-4 M-F) then you simply send them an e-mail 3 days ahead of time with VIN, make, model and date you plan to cross - that's it - no ownership or bill of sale req'd (all the posts I head read said ownership was req'd and it is not at Niagara - just call and listen to the directions on their voicemail message as they are very clear and thorough. When we arrived at the border, spent about 15 mins at US Customs (they were GREAT and very friendly) and 20 mins at Canada (they just collected cash)... and were on our way home. RIV, safety and emissions at Cdn Tire was simple (apparently Cdn Tire did more than 100,000 RIV inspections last year - they are very organized). Ontario license office was the longest part of the process as it was approx a 1 hour line-up and 20 minutes of processing (first clerk didn't know what to do with the North Carolina ownership, etc) The steps to import are documented many places and I can help if you like, but I will say it was way easier than I anticipated/feared/read.
And the car is everything and more I'd hoped it would be. Dreamed about a 911 since I was 12, and it has NOT disappointed me. Love this car. Should have done it sooner.
