I've driven a Volt since 2011 and just recently switched to an 85D. The Volt had this handy pedestrian horn which the Model S is missing. Wouldn't it be cool to just add some sort of small speaker in the frunk which makes a futuristic engine sound based on the speed of the car ? I just watched an episode of Extant which uses a lot of Model S cars and I could swear that they also added "cool" sounding electric noises to those cars as well. Does anybody else like this ? I am no engineer but I know that there already are a a lot of mobile apps that measure acceleration and speed. From there is should be small thing to add a bluetooth speaker that makes sounds according to acceleration and speed ? If this was available I would get it right away. Not only would the car sound great, it would make my daily commute much safer since most pedestrians can't hear the Model S at all.