In which city is the headquarters of the manufacturer of the engine used in the 1997 Rinspeed Mono Ego?
Hyundai Hyundai Group (Hangul:  ; Hanja:  , ] ) is a multinational chaebol (conglomerate) headquartered in Seoul, South Korea. It was founded by Chung Ju-yung in 1947 as a construction firm and Chung was directly in control of the company until his death in 2001.
Piper Aircraft Piper Aircraft, Inc., is a manufacturer of general aviation aircraft, located at the Vero Beach Municipal Airport in Vero Beach, Florida, United States and owned since 2009 by the Government of Brunei. Along with Beechcraft and Cessna, it was at one time considered one of the "Big Three" in the field of general aviation manufacturing.