The Ultimate Aero was built by Shelby Super Cars to rival the Bugatti Veyron as the fastest production car in the world. The Aero succeeded in this and as of October 2007 is the latest car to hold the position as the worlds fastest production car!! The Aero has a top speed of 412.233 km/h (256.15 mph) and a re-adjustment of the transmission makes it possible to reach speeds of 437 km/h (although a run at that speed hasn't been done yet).
