EDIT: Sorry, I should have written my original post a little differently
V8 Supercars run 370mm rotors under a 17" wheel so I don't think you would really need to go an extra three inches for a 380mm rotor. Whether we like it or not, it is important that 50 cent likes it because what 50 cent likes, America likes. Think about the slogan for the car "NEW NISSAN GT-R: THE 21ST CENTURY SUPERCAR FOR ANYONE, ANYWHERE, ANYTIME". This includes South Beach, the Sunset Strip AND Laguna Seca. Porsche knows this as well as anyone.22-inch wheels and Automatic transmissions sell the car to 50-cent. Nurburgring laptimes and split second gearshifts sell the car to performance enthusiasts like us. It is marketing genius and the only reason that this car exists at all.