Strap two seats to a 160 hp 2.0 liter Honda engine, a steering wheel and four tires and you have the premise of the Ariel Atom performance car. As their website proclaims: "No doors. No screen. No roof." The Atom is basically a race car, sans body panels. The entire car weighs a little over 1000 pounds and has a better power to weight ratio than the Porsche 911 so says the site. Though there are no dealers in the United States due to safety standards I'm sure – I wonder if you could get one just for track use?