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My 335i made the same noise everytime i started my car. I took it to the dealer and they dismissed it as normal. I went back and told them it's not normal because my other bmw has the same flap which is very silent and can only be heard if I'm in a garage (supposed to sound like a zipper). The F30 exhaust flap was very loud when compared to my E46's flap. They replaced it with a new exhaust under warranty. Now the screeching sound is gone.
Don't let them BS you like they tried to BS me. Have them fix the issue. It's embarrasing when people are around.
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