SSC Ultimate Aero: 257 miles per hour (413.6 kilometers per hour)
The Ultimate Aero, which actually held the speed record for a while, comes from Washington-based SSC North America, formerly known as Shelby SuperCars. This vehicle eschews electronic driving aids such as traction control and anti-lock brakes, instead concentrating on the purity of its speed. The Ultimate Aero that made the 2007 speed-record runs was powered by a supercharged V-8 sourced from Chevrolet. After some testing at the NASA facility, the Ultimate Aero raced down Highway 93 in Nevada that March, and the Guinness-sanctioned run was in Washington in September. Guinness announced that they had verified the new record that October, briefly displacing the Bugatti Veyron from the top spot.
And for those keeping track, the 257 miles per hour (413.6 kilometers per hour) statistic does tie with the 9ff GT9-R, but the Ultimate Aero's 2.7-second 0 to 60 miles per hour (96.6 kilometers per hour) sprint gives it the edge.