keep in mind, with a compotent tuner, you can order the tuner kit now and have the differences handled by your local mustang tuner.
in socal I recommend v's performance in orange ca.
galpin auto sports is also another good mustang tuner in southern California (of pimp my ride fame)
does v's performance do dyno tunes? ive been wondering what my car will put up on a dyno and maybe if the price is right i can get it tuned with the steeda tune for optimum power and to make sure the air to fuel ratio is spot on. although im pretty sure it is.