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The Dodge Viper SRT10 is a V10-powered sports car, manufactured by the Dodge division of Chrysler. Production of the two-seat sports car began at New Mack Assembly in 1991 and moved to its current home at Conner Avenue Assembly in October 1995.
The American Club Racing (ACR) model was introduced in 1999. This model had suspension and engine enhancements focused on maximizing performance in road racing and autocross environments. Horsepower was, by the use of K&N air filters and smooth intake tubes, bumped to 460 hp (370 kW) in these models, while torque increased to 500 lb·ft (678 N·m). Weight was reduced by over 50 pounds (23 kg) by stripping the interior and removing other non-essential items such as the fog lamps (replacing them with brake ducts). The new stiffer, adjustable suspension removed another 14 pounds (6.4 kg).
A new ACR was added to the Viper line-up after the 2008 model year. Its upgrades were more drastic than the original, including street-legal racing tires, two-piece brake rotors, adjustable suspension, and significant aerodynamic revisions. No engine modifications were made, so power and torque remain at 600 hp (450 kW) and 560 lb·ft (760 N·m) as in the standard SRT-10. The ACR is street-legal, and is similar to the MOPAR Viper that Dodge displayed at various auto shows. Its aerodynamic upgrades produce up to 1000 pounds (4.45 kN) of downforce at 150 mph (240 km/h), or roughly 10 times the downforce the standard Viper SRT-10 can produce at the same speed.
To commemorate the end of the second generation Viper and mend the gap from the car's production end until the release of the new car, Dodge offered an improved version of the ACR specifically designed to run in the Dodge Viper Cup Series. This car, named Viper ACR-X, added to the basic ACR 40 hp (30 kW), a new set of downforce-enhancing front canards, and new materials that, along with a stripped interior, reduced weight to 3,300 lb (1,500 kg). It is a purpose-built race car and is not street-legal. According to Dodge, the car beat the regular record-holding ACR around Laguna Seca by about three seconds (1:33.9 to 1:31). As of February 17, 2010, the Viper ACR-X's Nürburgring lap record was 7:03.058, a full 9.072 seconds faster than the regular ACR.
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