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      01-08-2017, 03:44 PM   #23
Private First Class

Drives: 2016 M4
Join Date: Jul 2015
Location: LA, CA

iTrader: (0)

Just listened to the videos. Like some of the other posters, I too have an exhaust valve controller and this sound is similar to when I manually open or close the valve (yours does seem to be a little loud). As it's only happening when in Sport+, this is when the valve would auto open/close depending on how you're driving. For instance, the valves will generally close when you go to 0% throttle position and re-open once you give it gas again (not sure the % break point on this). The valves are not fixed in one position in Sport+, and this sound would coincide with what you posted above.

As someone who gets rocks stuck between the rotors way too often, this is not what is occurring with your car.

Good luck!