You can and people have run Atmospheric DV's on cars that have'nt been remapped, and a few people seem to have done it without any issues, some on the other hand, have experienced issues.
When the car is remapped, thats when there seems to be a line, that the atmos dv's dont work.
But best bet is to listen to the people who have been there and done it, and then advise you not to waste your money.
As has been said, a similar sound can be achieved by using an open cone filter, with a forge 007 or Baileys dv30, on a remapped car.