is they didn't fade at all like when I was stock running up at buttonwillow. I'm guessing the bigger rotor can dissipate more heat. I'm not an advanced driver so I'm not able to push them to their limits but I did fade the stock sized rotors pretty quickly. Maybe a directional/vented stock sized rotor would do the same but the 350Z kit offers more leverage on braking also because of the bigger rotor.
I wouldn't say the stopping distance decreased a lot though but much better than stock. For my driving ability and style, the 350Z kit fits me well.