The Nissan GT-R has big Brembo brakes on it, that can make a bit of noise. Its not like the rest of the Nissan GT-R isn't noisy, but the brakes contribute to this cacophony of noise that is "normal" on a GT-R. The factory brake pads can squeel, the factory two piece rotors can click, the rear brake pads often rattle. There have been several people that have put an extra clip on the front brake calipers to quiet the front caliper down. In the rear the caliper clip has changed a few times, and for 2013 it has been changed again, and some members over at NAGTROC have documented the changes.
They are installed, so far the sound is 90% better.
Only hear a rattle when turned full lock and backing up reverse.