A Model S P100D running Ludicrous mode took on a pulley-swapped, drag-radial-equipped Dodge Hellcat at Atlanta Dragway, and the margin at the stripe came down to hundredths of a second. This piece breaks down what each car actually brought to the line, why reaction time mattered as much as horsepower, and how Dodge’s own SRT Demon was built a year later to answer exactly this kind of race.