This is the third time I have tired to post on this. IOS app is being annoying today.
Anyway, my car makes exactly the same noise at start up. And it's sounds horrible when cold. And I particularly like the noise from the heat shields rattling around the exhaust.
However, seems quite common and I am not to worries about it. Just not quite as premium as I would expect from BMW.
I can't comment on the other noises you have. The 1 series 4 cylinder engines as are a bit toneless. Again, I can only comment on the 1.6, I would hope the 2.0L sounds a bit better.
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