The 270R and 400R I know are definately real road-going cars developed by Nismo because I have seen photos and videos of them. However, what about the likes of the Nismo GT-R LM Road Version, Nismo Fairlady Z Z-tune, Nismo Skyline R34 GT-R R Tune and the Skyline R32 GT-R S-tune? I can't find any info on them apart from their presence in GT games so are they simply extremely rare Nismo cars or are they just concepts developed by GT and Nismo together?