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Switchable technology enables drivers to alter the noise from the modern 911’s exhaust. Here’s how… One of the most characterful elements of the 911 is the exhaust note. Whatever model you have, the soundtrack is a constant reminder of partly why we enjoy the cars so much. That sound comes via the exhaust system. While an exhaust’s job is mainly to vent combustion gases to the atmosphere, it has a secondary task: to control the sound, primarily to comply with noise regulations.