Quote:
Originally Posted by therealm3
Where do you read that it is interior sound only? When I look at the pic of the system I see a round part that has a bung for a vacuum line and then some sort of exhaust port off of the dome. So my guess is there is a valve in there and when you are in Eco and Comfort it is closed but sport and sport + open the valve creating more sound.
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This looks a lot like the exterior active sound on the i8. BMW hides the active sound speaker inside a fake metal "exhaust tip" (not visible from outside but if you have the car on a lift, look up around the left side of the rear bumper and you'll see it up there). Our guess is this: putting a speaker inside a fake exhaust tip that plays exhaust noises makes it sound more realistic due to the way the sound waves react to that metal tubing, the same way exhaust sound waves react with normal exhaust piping.