So anyone who owns a high power truck or a jeep knows that you can switch between 2 wheel drive and 4 wheel drive, usually by a stick on the floor, next to where the transmission stick would be.

I want to know if it is possible to do this in my car. I have a 99 a4 quattro, but i dont want it to always be 4 wheel drive. is it possible? how much money would something like this run me?