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I had my dealer open the right flap. The exhaust definitely sounds better, especially on a cold start. It will pop and burble a bit, especially in Sport Plus mode. There is a bit of a noticeable drone at highway speeds, especially when going up a hill. Some had said, on other threads, that the purpose of the flap is to increase turbo boost -- I do feel that I have lost some low-end torque with the flap permanently open
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