Change is racing down the streets of Havana, where Cuba's top underground drag racers struggle to prepare their classic hot rods for the first official car race since the Revolution.Change is racing down the streets of Havana, where Cuba's top underground drag racers struggle to prepare their classic hot rods for the first official car race since the Revolution.Change is racing down the streets of Havana, where Cuba's top underground drag racers struggle to prepare their classic hot rods for the first official car race since the Revolution.