Unrealistic idea for making an electric car sound like a real car
You would have to add much weight to the car for all the sound system material and traditional speakers wouldnt carry the sound like a real engine/exhaust system...and even if it did work, the weight added to the car and teh electricity used by this massive souind system wouild negate all the positive effects of using an electric car..
you just have to have an internal combustion engine and real exhaust to make that sound.
but i know, its just amovie