Well if ordering it's a no brainer, I personally bought off the lot and lucked up and got one with it, never thought it would really come in handy but it has been extremely useful, the awesome thing is it works in 4a, 4H and 4L, where if you do an actual locker up front you will be limited to 4L in most instances and by the time you engage it, it could be to late, this thing does it itself in a split second, most of the time it's so fast you don't even realize it is working. To try and answer
@Fozzy on why it wasn't included on the Raptor R is the engineers said that they felt the vehicle was built for high speed desert bashing and that it wasn't needed as much for that. I don't remember them saying anything about whether it could take the torque because as far as I know the 250 Tremors have the torsen and they put out more torque than the raptor R.