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Current vehicles have this engineered in. Cars like the F-Type, Focus RS and also the M2 have been engineered like this.
In case of the F-Type they spray a little bit of fuel in the beginning of the exhaust near the manifold that ignites in the exhaust and you gets you the burbles. At least that is what an engineer at Jaguar told me.
More and more cars have some kind of system engineered in and by changing the mode on the car the system inside change and give you a different exhaust note.
It could well be there is a second flap some cars, but I did not see this flap when I changed my exhaust at Akrapovic. There was nothing there other than the turbo and then the downpipe.
MR
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