The Mercury Cyclone Spoiler II is a muscle car that was produced by Mercury in early 1969. The Mercury Cyclone Spoiler II was a special, more aerodynamic version of the Mercury Cyclone. It was produced specifically to make Mercury even more competitive in NASCAR stock car racing, and was sold to the public only because homologation rules required a minimum number of cars (500 in 1969) be produced and made available for sale to the public.