I don't know why everyone is getting all over the person who created the question here. It is not like the ACR has a different engine that is more powerful or anything. Add the wing and splitters on and you are most of the way home.
If anything, the convert is faster than the ACR in a straight line because of the lack of drag from the aero. Testing by members on the site has proved this. For most people who don't track, this would be nothing but an accessory package that looks cool in some minds.
In fact, at moderate speeds, the aero does little to nothing. Only at higher speeds does it add to downforce. The track you race on dictates how much the ACR package will help, if you race at all. Don't assume that the people who order an ACR actually race the car. Other than keyboard bravado, I don't see it that much.
It would be a quick way for Dodge to get 10k to 20k out of people. They should consider it. If you are worried about injuries from a convert at the track (if they allow it at your track at all), then simply don't order that car. Limiting the choices of potential car owners is frankly stupid at this point. They are not selling Vipers and the car is going away because of this. Limiting color choices to potential owners is also a foolish concept. Just because people bought a car 10 years ago with a certain color combination should not preclude the manufacturer from making that car color again.