here is my modified nt1 disk. i've used two stock disks on my car to improve heat disipation and braking. i'm using the KM racing carbon fibre brake pads.
stage 1

i thought that it wasn't enough, so i went a little further. i elongated the channels so the air can escape through the disks as well:
i never had issues with the brakes overheating with two disks, but i wanted to do this just for the individual factor