So there's already plenty of legend behind the Daytona even before it shows up in this movie. And, well, it's no surprise, but Dom's Daytona isn't really a Daytona at all.
Keep in mind that a production as large as Fast & Furious 6 needs multiple examples of every onscreen car to keep filming no matter what the contingency. And particular cars need to be built in particular ways to deal with particular stunts or appearances. So this isn't about just one Daytona, but seven built to portray Toretto's fictional machine. Three survived filming.