Dodge Viper ACR

 
The options for the car are very diverse, like all other Viper trims.The package included the addition of a removable extended front splitter extension, a new adjustable dual-element rear wing, four dive planes, six removable diffuser strakes, removable brake ducts, and removable hood louvers, and if removed, will reveal a hood gap.
 
This helped the car produce an extra 227 kg (500 lb) of downforce in cornering, for a total of 907 kg (2,000 lb) of it. With this package, the car can top out at only 177 mph (285 km/h) instead of 191 mph (307 km/h) because of the massive downforce the car produces. At the top end speed, the car will produce 799.5 kg (1,763 lb) of downforce at acceleration, the most of any production car.
This model had suspension and engine enhancements focused on maximizing performance in road racing and autocross environments. Horsepower was bumped to 460 hp (370 kW) in these models, while torque increased to 500 lb·ft (678 N·m).