I am going to assume here that you have a NA ( non-SRT6 ) car.
If this is true, the difference between what you have and 'upgraded' calipers is in heat dissipation.
Your current setup will already reach the point of cycling the ABS, it's a matter of how many times in a quick succession you can do this lockup without losing some braking ability.
Updated calipers ( which also implies larger rotors ) will give you much more continuous braking power ( useful if you road race or drive the Dragon all the time ) but the stock setup is fine for the other 95% of us.