|Dodge Viper ACR|
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The American Club Racing (ACR) model was introduced in 1999. This model has suspension and engine enhancements focused on maximizing performance in road racing and autocross environments. Horsepower was bumped to 460 hp (370 kW) by the use of K&N air filters and smooth intake tubes which also increased torque to 500 lb·ft (678 N·m). It weighs 50 pounds (23 kg) less than the original as it has a stripped out interior as well as having many other non-essential items such as the fog lamps removed removed and replacing them with brake ducts. New stiffer and adjustable suspension removed another 14 pounds (6.4 kg) from the overall weight. This model also has engine and handling modifications, an "ACR" badge and 20-spoke BBS wheels.
A new ACR was added to the Viper line-up after the '08 model. Its upgrades were more drastic than the original including street-legal racing tires, two-piece brake rotors, adjustable suspension and significant aerodynamic revision. No engine modifications were made which kept the power and torque at 600 hp (450 kW) and 560 lb·ft (760 N·m). The ACR is street-legal and is similar to the MOPAR Viper that Dodge displayed at various auto shows. The weight in this model was also decreased by 80 lb (36 kg) with a "Hardcore Package" and removal of the radio, speakers, amplifier, trunk carpet, hood pad and tire-inflator. Its aerodynamic upgrades produce 1000 lbf (4.4 kN) of down-force at 150 mph (240 km/h) which is roughly 10 times the downforce of the Viper SRT-10 at the same speed. A beacon-tripped lap timer was added to the interior.
The Viper ACR was built alongside the standard SRT-10 at the Conner Avenue plant in Detroit. The aerodynamic components were produced and assembled to the vehicle by Prefix Corporation located in Rochester Hills, Michigan.