"9C1" is an RPO (Regular Production Option) specification used internally to General Motors
to designate the police
pursuit model of popular Chevrolet
sedans throughout the years.
Models to bear the 9C1 RPO include the Nova (1975-1979), Malibu (1979-1983), Impala/ Caprice (1979-1990), and the infamous Caprice Classic (1991-1996). After a four year hiatus, the 9C1 designation returned in 2000 with the sixth-generation Impala, a FWD V6 unibody car.
The current Impala is due to redesigned with the 2006 model year, 9C1 availability status currently indeterminate.