Yeah but think about it.
Half of them are Skylines with no difference whatsoever in body or power and only differ by the name they're under in GT. I think there's six or so of basically the same R33 for example, although one is premium (which we should keep).
Just minimize those down to one each of the generations, the V-Spec for example (plus perhaps the NISMO version of each = Z Tune, etc) and you've vastly reduced the number of Nissan's in the game. Leaving space for models that are actually different.