surprised that no one suggested that the weight of the exhaust can might have played a part in the bike drifting right. 
It is ridiculous to suggest that "They all do that" and any stealership that does something like that doesn't deserve your business. I have an 08 and it is straight as an arrow. Any bike designed to drive in excess of 100 mph would never (on purpose) drive that way, when they say "They all do that" they are telling you that they are clueless and you probably know that already, that's why you are asking us.
As far as the weight of the potato launcher, remember the final drive is on the other side of the bike and is pretty heavy in its own right.
Did they get the front fork assembled correctly? If one side of the fork tube is not positioned correctly it could cause pull. Perhaps a bad front bearing on the right side but you would feel that through the handle bars. If not that then the tires are the next likely cause. Get someone you trust to drive it, (to make sure it's not just your imagination) it's better if they don't know about the issue and ask them if they think it has any weird issues when they drive it so they don't keep anything they feel to themselves out of not wanting to rain on your new bike parade. If you both feel it, the dealer needs to help you find out what is wrong on your NEW warrantee bike that you just gave them money to own. Tell them to get their best tech on it and they will get your money through replacement tires, farkels, and helmets, whatever. It sucks when you want a new bike experience and get this, they should have found this before you ever threw your leg over the saddle.