When Ford engineer Steve von Foerster had a neighbor call the police over his Shelby GT350’s exhaust note during an early-morning drive, he brought the story back to the office and helped create Good Neighbor Mode for the 2018 Mustang GT. Quiet Start and Quiet Exhaust drop the V8 to roughly 72 decibels, about the level of a dishwasher, and can be scheduled from the steering wheel for the hours when a loud car is least welcome. Read on to find out how a 911 call became a factory feature.