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Message: <blockquote data-quote="paultantk" data-source="post: 540198" data-attributes="member: 6665">Why don't you record the gu gu sound and let us hear? Put on YouTube. I'm quite curious on how it sounds like, maybe I have it but have been missing it or thought its normal.You can have your opinions on the 520d engine but as an owner of a 520d and someone who has driven the 520d, 523i, 528i, 535i, 535d, and even the 550i, the 520d engine in my opinion is not that much louder than the petrol engines from the interior of the car. It's just the tone is different, a way to describe it would be the petrols have a sweet chick's voice while the 520d has a sore throat.</blockquote>