Mercury Cyclone Spoiler II prototype, 1970. Powered by the Boss 429 V8, the Cyclone Spoiler II was to take part in the NASCAR series and was closely related to Ford King Cobra. However Ford withdrew from racing after 1969 and NASCAR effectively banned the "aero cars" so despite their racing success in 1969 the Cyclone Spoiler II program was cancelled
Toyota MR-J Concept, 1995. Presented at the 31st Tokyo Motor Show and then in Chicago, as a potential successor to the second generation MR2. However an adverse reaction to the concept, that had been designed by Toyota's Brussels design office, lead to major rethink and the MR-J with it's "aero-roof"was shelved