The Guinness World Records' holder for fastest street-legal car, the Ultimate Aero can punch it from zero to 60 mph in just 2.78 seconds. To keep tabs on the amount of power you're using (the car's engine develops 1,183 ponies, more than any other car on the road), there's a horsepower gauge on the dash. With this car, you're paying for the engineering and what's under the hood. The Ultimate Aero isn't a plush ride. It doesn't have power steering, and its luxury details really only include Recaro leather seats, a sweet sound system and a navigation system. With this car, you're paying for the engineering and what's under the hood. The super-powerful engine simply roars as this this amazing machine is put through its paces on the track or a curvy backroad.