Koenigsegg Agera One:1

The odd name refers to this car's horsepower-to-weight ratio of exactly one horsepower per kilogram. It's powered by a 5.0-liter V8 that puts out 1,341 horsepower and it weighs 2,956 pounds, or 1,341 kilograms. If you want one, sorry: Only six are being made and this Swedish supercar builder has already sold them all.

First published March 5, 2014: 3:25 PM ET

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