The car has no propulsion at all. Use roll to make the speaker move. The force of the subwoofer moving that large amount of air should push the car a little. It should work in theory. You can also turn on mouse steering and move to the beat of your favorite music. Mouse steering only works of there is enough force in a vibration shake the mouse so tap the mouse pad or play pencil drums on it or whatever you want. If You have a stereo that shakes your mouse then you can play the same bass I tested this with. It is all instrumental. It is mine. https://www.youtube.com/playlist?list=PLiKT3O0aJypteExFWWo02ZrV5yBlX6UcF enjoy as you wish.