From American Graffiti to The Fast and the Furious, street-fighting custom cars still seize the American imagination, along with their share of a $300 billion annual business in the North American automotive aftermarket. John Hennessey has grabbed his share as well: Over three decades, Hennessey has gone from building hot rods out of a Houston apartment to become one of America's leading builders of superpowered, over-the-top rides. Hennessey is on a mission to break the mythical 300-mph barrier with the Venom, and to top the 304-mph record set by the $3 million Bugatti Chiron.