Porsche is cutting total production output of Carrera GT's from 1,500 to 1,250 units. Most of the 250 dropped units would have gone to the United States, a Porsche spokesman says. Since the Carrera GT went into production in January 2004, 396 have been sold in the United States through July. Porsche says the $440,000 car won't meet the 2006-model requirements for smart airbags, and the National Highway Traffic Safety Administration wouldn't grant a waiver.