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Had mine installed last week and have exactly the same as the above.
I'm not convinced it's a faulty exhaust as it only does it for the first 10 - 15 secs on cold start up, at no other time does it make that slight metallic noise.
It just sounds like it's too close to a heat shield or something, but I've not been under the car to see the design or what components are around the exhaust route.
I'm guessing there's been no acknowledgement from BMW or a fix?
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