It depends on if you have many mods, if you are all stock and you put in true dual exhaust with headers you will feel a difference... If you are SC/TC then probably not... Lots of people say that headers deepen the sound ever so slightly... I can't speak from experience because I don't have a Mustang, hopefully someone else will chime in with help.
Faster than a speeding...............
2001 Bullitt being prepped for track duty
Corners > Straight line
HID end all thread