there is no reason to put miles on it first, i am just a little quirky about my vehicles, whether they be cars or bikes, i always buy stock standard, then i add on later and i can see the difference, with my first harley , bought it dead stock, ran it for about a month , then put tapered turbo screamin eagle air cleaner and jets, super loud , and i am still loving it , havnt sold it and has 100,000 km on it.
the bikes when they come to australia , have a few different things to the american bikes, such as different mirror stems, who knows why, amber lens not smoked and they are not running lights they are only indicators, and the mufflers do not look like the pictures on the web or in the catologue, they are large tapered , similar i think to the californian ones,
so imho go and do it now , get ther pleasure of firing it up over winter, and think of me in australia second day of summer pouring rain for the next few days , but after that endless days of riding,
i have taken the photos and i am now looking for the cord to plug the camera in so i can put the photos up,
plus i cant wait to take it out and blast the pipes,
getting back to your original query though, the service manager at my dealership bought a brand new heritage the day i got my bike, and put exactly the same set up on straight away