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It's a vibration damper on the muffler, to keep the car from shaking.
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ah okay, I didn't think of that!
I went to the dealer today and asked the mechanic about the flutter valve in the exhaust. He said it is "strictly for sound dampening". I asked him if it could possibly change the backpressure but he said no, it is not for performance, only to quiet the car a bit. I mentioned the idea of pinching the hose, or disconnecting it for a "louder rumble", he thought it was pointless , but said it wont harm anything.
Just thought i'd share!