Ford’s 2018 Mustang GT found an extra 25 horsepower and, more importantly, a 10-speed automatic smart enough to hold torque straight through every shift. Combined with the Performance Package’s grippier tires, that Drag Strip mode dropped the GT’s 0-60 time to a genuinely shocking 3.9 seconds. Here’s how a bone-stock Mustang joined the sub-4-second club.