the michigan state police also maintained a performance file but they would only test 4 door cars that met the criteria they set out---certain weight--4 door--engine size--and i think only american made------the california guys tested every car that was advertised as a police car--city cops ran 4 door cars but alot of state cars and sheriff cars were 2 door sedans---plymouth and dodge offered c body 2 door sedans until about 1973? colorado ran the big 2 door sedans until they were phased out by the factory....