I am pretty sure its just that. Plug the ecu flasher in to the obd2 socket and flash the desired map to the car. Usually these things can flash your car back to stock, but it would be the best if you consult with REVO first.

Also, does anyone know how well the current S4 handles compared to the current RS4? I always thought that the RS versions were not necessarily faster than the S, but definitely handles on a whole different level. Nevertheless, the straight line power of the supercharged S4 with flash is not something to look down upon.