Speaking of brakes, last week for the first time, and only for a kilometer or so, I pushed my car to the limits of my driving ability; acceleration, braking and cornering. I picked the time and place carefully so only put myself at risk.
I scared the sh1t out of myself. I learned a couple of things; I lack the skills to drive like that and the brakes, although adequate, did not give me the stopping power for that sort of driving.
So, like the OP, I am considering the possibility of upgrading the brakes. I have no intention of repeating that drive but I would like to know that in an emergency I can stop quickly and in a safe manner.
Is there a great difference between the stock brakes on my car and 4 or even 6 pot brakes? Not having driven a car fitted with serious brakes, I have no idea.