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FWIW, I have a '13 335i MSport with about 4k miles on it. I really feel that the exhaust note has improved significantly since the car was new. I am much happier with the sound now, especially in Sport mode.
I have tried the exhaust flap unplugging mod and liked some of the results, but it picked up a little drone at lower RPMs on the highway.
I hope you find a way to be satisfied with you new car. It is a beautiful ride. Enjoy it!
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