The distance it takes to stop a car is generally limited by a ratio of the weight of the car vs the amount of adhesion from the cars tires. When you slam the brakes on very hard, your car will go into ABS mode. The cars computer will then regulate the braking to the maximum possible based on slippage of the tire against the road. If you want better braking you need to buy a stickier and wider tire which will give you more adhesion to the road. Stickier Tires would wear out more quickly and diminish your range, but that’s the trade off. Bigger brakes like on a GT Porsche or something are only really going to help in a track like situation where the brakes are used at a maximum level over and over again and a smaller braking system could overheat and eventually fail. These are not the conditions that any of us would be using a Model X for. The main issue a fast moving X would have in stopping quickly is it’s weight and tires. You can’t change the weightMy wife suggested they stop something similar by locking the top speed and only making it available once a brake kit Is available (to which you’d have to pay an additional $20K.
I’m indifferent about that, as I’d want the top speed, but would be fine with just the 0-60.