Electric vehicles are here to save the environment (or at least kill your fuel bill), but if you listen to some people they're also here to mow down our pedestrians thanks to their ninja-like ways. Nissan's Leaf has already gone the way of sci-fi by offering a Blade Runner-inspired exterior soundtrack to make sidewalk replicants take notice, and now the Prius is joining in on the fun with its own under-hood speaker system. Curiously, this one will be optional, Toyota app
