World's Fastest Production Car!!!

Shelby Supercars (SSC), manufacturer of the ultra high-performance Ultimate Aero Twin Turbo, set the new "World’s Fastest Production Car" record with an average top speed of 255.83 mph. Confident of the 1183 bhp vehicle’s abilities, SSC set out to validate their top speed claim in accordance with the strict guidelines set by Guinness World Records. Among other requirements, in order to meet Guinness’ approval, a vehicle testing for the top speed record must drive down the course, turn around, and make a second pass in the opposite direction within one hour. The vehicle’s official “top speed” is calculated by averaging the top speeds of each pass in order to negate any favorable road or weather conditions. In September 2007, on a temporarily-closed 2 lane stretch of public highway in Washington State, the Ultimate Aero posted a top speed of 257.11 mph (413.83 km/h) on its first pass and 254.55 mph (409.71 km/h) on its return pass, yielding a new top speed record: a staggering 255.83 mph (411.76 km/h). The data, collected by Dewetron's world-renowned GPS tracking system, will be verified by Guinness before the Ultimate Aero is officially crowned the "World's Fastest Production Car." This breaks the current official record held by the Koenigsegg CCR at 242 mph by 11.83 mph and the Bugatti Veyron's unofficial speed of 253 mph by 3.11 mph.

Specifications:
Engine
Type: Supercharged V8
Displacement cu in (cc): 387 (6342)
Power bhp (kW) at RPM: 1183(883) / 6950
Torque lb-ft (Nm) at RPM: 1094(1484) / 6150
Redline at RPM: 7200
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Brakes & Tires
Brakes F/R: ABS, vented disc/vented disc
Tires F-R: 235/35 YR19 - 335/30 YR20
Driveline: Rear Wheel Drive
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Exterior Dimensions & Weight
Length × Width × Height in: 176.2 × 82.7 × 43
Weight lb (kg): 2750 (1249)
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Performance
Acceleration 0-60 mph s: 2.78
Top Speed mph (km/h): 255.83 (411.76)
Fuel Economy EPA city/highway mpg (l/100 km): n.a.
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Base Price: 2007 SSC Ultimate Aero - $654,500 / 538,400 € (last update: 9/17/2007)

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Source: http://www.rsportscars.com