Year: 1981
Debut at: Chicago Auto Show
Production cost: $1.5 Million*
Not what many may have been expecting from Dodge, the M4s was a fully-functioning prototype that could reach 200 miles per hour! Though not especially elegant or sleek in its exterior design, it conveyed speed and power with its twin-turbo Cosworth engine.
Though its rather unappealing brown color did not help the M4s stand out, it was featured in the 1986 film The Wraith.
Lotus Eterne
Year: 2010
Debut at Paris Auto Show
Production cost: $190,000*
A major leap up from your average four-door sedan, the Lotus Eterne set car enthusiast’s hearts on fire. Beneath its elegant and powerful frame, the Eterne was set to feature hybrid technology and had a 5-liter supercharged V-8 engine.
And with 620 horsepower, it could reach about 62 miles per hour in only 4 seconds! Sadly, this paradoxically beautiful model was never given to the masses either.
Ferrari Mythos
Year: 1989
Debut at: Tokyo Motor Show
Production cost: $3 Million*
This stunner was created by the Pininfarina design company and was first shown at the Tokyo Motor Show in 1989. The Mythos would eliminate your morning commute as it could hit 62 miles per hour in 6.2 seconds and reach a max speed of 180 miles per hour.
Surprisingly, it wasn’t received with much enthusiasm and was never mass-produced. However, the Sultan of Brunei specially requested that two be made just for him. And yet, to most everyone today, the Mythos seems to be just that: a myth.
Saab Aero-X
Year: 2006
Debut at: Salon International de l’Auto
Production cost: $800,000*
The designers of the Saab Aero-X pulled out all the stops to give this concept both retractable doors and a retractable canopy. The Scandanavian based brand also gave the Aero-X a bioethanol-fueled V-6 engine, all-wheel drive, and a carbon-fiber body.
However, the Aero-X was not prioritized in Saab’s production and no further progress was made on this concept.
Cadillac Ciel
Year: 2011
Debut at: Pebble Beach Concours d’Elegance
Production cost: $100,000*
Strongly reminiscent of times gone by, the Cadillac Ciel may at first seem more suited for a 1930s mobster than a 2011 consumer. The Ciel houses a twin turbo-charged 3.6 liter engine that puts out 425 horsepower.
Designed by Niki Smart, the four-door concept is a modern classic with a wood dashboard, rear suicide doors and a hybrid system that utilizes a lithium-ion battery. However, the most public appearance that the Ciel ever made was in the 2015 movie Entourage.