I found this picture of an M6 with what looks like "Butterfly Exhaust Tips" if that is a way to explain it. I would think this exhaust has the ability to close the exhaust a bit to help in making the car quieter when needed. By producing more back pressure will silence the car some. I have inserts that I got from RPi that I install when I want the care to be a bit quieter. But I love the sound so much that I never use them. But if this is what this car has, a way to quiet the car when needed, with these butterfly gates, what a great idea. Anyone have any input about this system and if this M is on the board? Would love to know how this is done.
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