You won't hear it at first. Nothing, nothing, nothing and then you get the sort of roar that sounds as if Darth Vader has been taken by surprise by an amorous Tauntaun. There's no warning. Let the revs drop and just as quickly, this frankly bizarre MP3 file quits. There has to be a way of plugging a laptop into the car's OBD port and, finding that file and changing it. We quite fancy the sound of the T. Rex from Jurassic Park.