America's most-powerful production car, Viper is a convertible with a manual folding top and heated glass rear window. The only engine is a 500-hp 8.3-liter V10. The sole transmission is a 6-speed manual. ABS is standard. Tires are run-flats on 18-inch front wheels and 19-inch rears. Side airbags and antiskid or traction-control systems are unavailable. Standard features include leather-and-faux-suede seats, tilt steering column, power-adjustable pedals, and xenon high- and low-beam headlamps. New for 2004 are trunk carpeting and red-colored brake calipers.