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The BMW M5 (an example of exactly what the Model S is competing against) already does this, because the interior cabin is so well insulated that you can't hear the turbocharged V-8, and owners want to: http://reviews.cnet.com/8301-13746_7-20111031-48/bmw-m5-gene...

Actually this exists, but not for cosmetic reasons. Hybrid cars on their motors are just so silent that they're worried that someone (probably someone blind) will be hit by them.

This already exists. The Nissan Leaf emits some cool sci-fi sounds by default, and I heard a dealer mention it can be replaced with a large selection of sounds by specialized auto shops.

If I ever get one, I totally want it to sound like the car on the Jetsons - https://www.youtube.com/watch?v=QdWswvLPdE0

The future version of the coffee can exhaust pipe.