I like pure electric cars but one thing that sometimes annoys me is how quiet they are. Many car enthusiasts will never buy electric cars solely because they don't sound as "cool" as a roaring internal combustion engine. Also, it is dangerous for cars to be so quiet. Many pedestrians and drivers rely on sound to help them pinpoint oncoming vehicles. Some car companies have been working on stereo systems to alleviate this problem but this is just artificial sounding. Can something be done to make an electric motor louder by mechanically altering it?