If you connect Nissan Consult to the Car it will not show that it has been remapped , but if a Uprev dealer connected to the car it would show that that the car has been Uprevved , but we can reflash the cars back to stock and then no one can seen that it has been mapped.
hope this helps
Nurrish , that was for the R35GTR tuning, not the 350/370 tuning.
Mark