"how fast you stop is determined by your tires, not your calipers, at least in any Porsche. For one minute forget about threshold braking and think about braking with all four wheels locked (and with no directional control). Most any car can do this (that is, lock-up all four wheels). Once this happens you have shown that you brakes have a higher grabbing power than your tires. Your wheels have stopped moving and that is all your brakes can do. Now your stopping distance is a function of the friction between your tire and the road surface. A higher adhesion track or a stickier tire compound will shorten your stopping distance and nothing else. Well, lightening your car or changing the weight balance will also affect it, but that's a different direction"
