Fair enough. I just get the impression that all this was done at the point of original sale, rather than afterwards. Though can't be certain of course.
Other than the standard GT Pack, it seems to have 19" Nismo LMGT4 wheels, Nismo exhaust system, Nismo gear knob, Nismo bonnet decal, Nismo boot badge, aluminium entry guards, tinted rear windows,and the top of the rear strut & interior door handles are a carbon fibre style, rather than the original colour. It has rear parking sensors too, but I presume that most of the later models had this. And a Bluetooth adapter, which I have yet to conquer.