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Hello, I have a Range Rover L322 with a BMW M62TU44B Vanos motor in it. I have just swapped out all three guides rails, and re-furbished both vanos units. The car is running very nicely, and is super smooth and responsive, however it has a strange (and very noticeable) "whining" or "buzzing" sound when the engine is taken above about 1500 RPM. Perhaps what i should say is, I think the noise is always there, but it becomes extremely noticeable over 1500 RPM, and gets increasingly louder as the RPM increases. This is a youtube video of the noise it is making. This video is taken at about 1800 RPM. https://www.youtube.com/watch?v=KaqdqBQ4ClY It is coming from the left bank of the engine.