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Currently, the only manufacturers authorized to compete in NASCAR are General Motors, Ford, Dodge and Toyota. The individual models are Chevy Monte Carlos, Impala SS (Car Of Tomorrow), and Silverado (Truck Series). For Ford it's the Fusion and Taurus (Busch Series) and the F-Series (Truck). Dodge has the Charger and the Avenger (Car Of Tomorrow) and the Ram in the Truck series. Toyota is the Camry and the Tundra in the Truck Series.
Typically models only models less then two years old are allowed to compete in the Nextel Cup series.