I wanted to add the performance package and active valve performance exhaust. My dealer has yet to get back to me but from what y'all have said, I'm hoping it won't be too much of a problem. I'd be okay with pushing the production date back or even having to cancel and reorder, as @JohnP said...
As the name suggests, I'm not a car guy. I've loved mustangs since I was a kid, but I'm still fairly young and inexperienced when it comes to the real world, so... what better time to buy a car? Anyway, being not a car guy, I kinda just rushed into ordering one when I finally made the decision...