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got 2 520d m sport - but why the sound difference ???


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Hello All 

As the title says i have 2 520d m sports, 2014black and 2015white. They both run perfect but I'm just wondering why there is a difference in engine noise when revved? the 2015 has less miles but sounds more tractory ( if thats even a word lol ) . When idle they are both the same, so i wonder why the difference in the 2015white and should i be worried? 


btw - the 2015 white had a recent timing change ( got a 12 month warranty on it, but cannot remember what it sounded like before)

final note - ive owned both cars only a few months. 

please have a listen to the 2 vids - they were both started today in the morning on cold starts


my friends are saying ive gone mad and its just 1st world problems lol 

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