For normal driving the Mustang stuff is more than adequate IF you optimize them. By that I mean two things. 1- Using the most aggressive pads available for ambient temperature braking. I have Hawk HPS front and HP+ rear. 2-Getting the front to rear balance right is crucial. I have staggered the pad compounds and also have bias adjustable CNC dual master cylinders. This works great for street and autocross. As Bob mentions it wouldn't work for more than a few laps on a track. There you need to get rid of tons of heat and that only happens w/ big, big brakes and cool air ducting.