You can either uprate pads or pads + discs
Normal dayto day use it is very unlikely you will find a limit of 'normal pads' unless they get very hot.
However on a trackday you probably will.
During sustained heavy braking both your pads + brake lines will heat up. When standard pads get very hot they 'fade' meaning your pressing the pedal but your not stopping anywhere near like you should be due to heat comprimising the pad. The solution, changepads. however a decend pad will quite happily eat a standard disc for breakfast as the pad is harder than the disc, that solution is to replace both pad + disc which a fair amount do.
Then you have a pad+disc that match and stop you well.
Downside to the above is possibly cost depending on your budget, pad screech, dust and a gradual braking increase or on/off braking.
Only other difference is the brake lines. brake fluid along with pads gets warm during heavy braking and when the fluid boils it can expand and rubber sections of your brake lines. As standard these are the flexible bits on both front wheels and just in front of the left rear wheel on 1*2's. The solution is to change the rubber hose sections for metal clad hose sections.
All the above make for a sustantially better braking system