BMW M4 Active Sound Design defeat beforeafter

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=gB0apslghXU

Laps of Brands Hatch Indy circuit in a BMW M4 with the Active Sound Design system enabled and then disabled by unplugging the dedicated amp from the car's main Harman Kardon system in the boot. Full story to follow on PistonHeads.com • -- • For more from the world of motoring head over to PistonHeads TV: http://www.pistonheads.com/tv • -- • FOLLOW US ON TWITTER: / pistonheads • LIKE US ON FACEBOOK: / speedmatters • VISIT OUR WEBSITE: http://http://www.pistonheads.com/

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