Although Bugatti Veyron made by is the fastest production car currently with a price tag of US$.1.7million and a top speed of 253mph achieved by its 1001hp Narrow Angle W16 Engine and ended McLaren F1′s (Top Speed: 240mph) 11-year reign as the fastest production car in 2005. Today several cars are in various stages of development that have proven faster in trials.

One such car is the swedish-made Koenigsegg CCX whose manufacturer also claims that it is capable of exceeding 250mph putting it at par with the Veyron. Infact CCX ended the reign of McLaren F1 but its own reign was short-lived as Bugatti immediately updated its Veyron. Koenigsegg has announced that they will update CCX very soon.

Yet another challenger is SSC Ultimate Aero which on Sep. 13th, 2007 using a closed section of Washington State Highway clocked a top speed of 256.18mph using a V8 engine half-the-size of Veyron’s. It generates 1183bhp &  of torque (Veyron: 479lbs). The car’s website page(www.sportscarcup.com/ssc-ultimate-aero/) lists the top speed as 273mph. Price: US$0.6Million.

Another equivalent of this amazing challenger is the fast yet modified supercar built by Barabus called Barabus TKR having 6L V8 Chevy bi-turbo engine capable of generating an amazing 1095bhp & acgheivingtop speed of  270mph. The body & chasis of the car are both made of carbon-fibre. It is rumoured to reach 0-60mph in 1.67sec which is amazing since even 4 sec qualifies for supercar.

An obscure modifier using modified versions of Dodge Viper under name of Hennessey SRT-10 Viper Venom 1000 Twin Turbo Coupe claims to challenge Bugatti Veyron (even SSC Ultimate Aero) using a 500bhp Viper engine reworked to give 1000bhp at 15psi instead of the usual 10psi creating a 255mph marvel priced at a ‘reasonable’ US$0.225million.

Colani Racing of Switzerland has designed a roadster which is yet to see the light of any road other than the 24-hour LeMans Circuit. With a 900hp engine The Colani LeMans is rumoured to have a top speed of approx. 255mph. However there is no news regarding any plans for commercial production and Colani are uptil now only producers of cars for racing purpose.

 Callaway Corvette Sledgehammer reached a top speed of 254.76mph on  Oct 19, 1989 driven by John Lingenfelter. Only 1 of these cars exists, although, at the time Callway Motor Company claimed that they could reproduce it for 0.400million. It seems no one wants one at that price & it has ended up being a concept car rather than a commercial production model.

Other concept cars that failed to become production cars included Oldsmobile Aerotech Short Tail (Top Speed: 257mph); Lotec C1000 (Top Speed 268mph); F-Bomb 1973 Camaro (Top Speed 270mph); Bristol Fighter SCR (270mph – electronically limited to 225mph); Audi R-Zero (Top Speed 253mph); Melling Hellcat (Top Speed 276mph) & the 2000hp Walley Larson LE1 Groundfighter (Top Speed 305mph).

Anything I missed please do let me know.