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MPower.com gives us a deep dive look into the M4's exhaust system courtesy of an interview with Chief Noise Making M engineer Rainer Drees.

http://m-power.com/_open/b/closedroom.jsp?lang=en&x=3165

Rainer Drees: I am responsible for the acoustic characteristics of M automobiles. This relates to everything that the driver hears as well as everything that can be perceived in the surroundings.

One of my jobs is to ensure that our M cars sound authentic and full of character while at the same time meeting the various worldwide regulations regarding external noise levels. This is above all a matter that concerns the design of exhaust systems.



 
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