The white Nur on carsales belonged to a forum member and is sold.
The majority of Silica Breath GTRs are M specs. As was stated, Silica Breath was also available in M spec Nur but they are so rare that Kristian from Iron chef has stated several times that they do not exist as he has NEVER seen one.
Wongy, I am aware of the car in Sydney that you are referring to and it is a M spec, it is not an M spec Nur.
Even M specs in gold are very rare however.