The Shelby Supercars Ultimate Aero Twin Turbo set the new World’s Fastest Production Car record with an average top speed of 255.83 mph.
On a temporarily-closed 2 lane public highway in Washington State, the SSC Ultimate Aero posted a top speed of 257.11 mph (413.83 kph) on its first pass and 254.55 mph (409.71 kph) on its return pass, achieving a new top speed record: a staggering 255.83 mph (411.76 kph).