Ford’s design studios didn’t stop at the Mustang that made it to showrooms, they also sketched a mid-engine two-seat exotic, a European-flavored roadster, an 855-horsepower one-off, and even a station wagon wearing the pony badge. Some near-misses shaped legendary programs that did get built; others vanished after a single running prototype. Read on to see which unbuilt Mustangs came closest to changing the car’s entire story.
For every Mustang that rolled off a production line, there’s another that never made it past a clay model or a single running prototype. Ford’s design studios sketched two-seat roadsters, European-flavored grand tourers, mid-engine exotics, and even a station wagon wearing the pony badge, cars that could have completely rewritten what “Mustang” means. Some were killed by cost, some by corporate politics, and at least one left such an impression that it helped shape an entirely different legendary Ford. None of them share showroom space with the millions of Mustangs Ford actually built, and each one tells a different story about roads not taken. Which of these near-misses would have changed the Mustang’s story the most?
The Mustang I Concept That Started It All
Before “Mustang” meant a pony-car coupe, it meant a two-seat, mid-engined roadster built inside Ford’s Advanced Design Studio under Lee Iacocca’s direction. The Mustang I was conceived to test public reaction to a genuinely sporty compact, something closer to a European sports car than anything Ford was selling at the time. Reaction at auto shows was enthusiastic, but the car itself was judged too exotic and too far from mainstream buyer needs to become the production Mustang that would ultimately carry the name. That immersion in genuine sports car proportions rather than family-car styling is precisely what made the concept feel so far removed from anything Ford was already selling in showrooms.
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How a Cancelled Roadster Helped Build the GT40
The Mustang I’s cancellation wasn’t the end of its influence. Engineering and design ideas explored during the two-seat roadster project fed into Ford’s broader push toward serious sports car performance, helping pave the way toward the GT40 program that would eventually take on Ferrari at Le Mans. It’s an unusual legacy for a car that never reached showrooms: a rejected concept that quietly shaped one of the most famous racing programs in American automotive history. Few concept cars can claim they shaped a Le Mans-winning program even after being rejected outright, which is part of why enthusiasts still treat the Mustang I as more than a footnote.
The Avventura Concept’s European Detour
Not every unbuilt Mustang came out of Dearborn. Ford’s Turin-based design studio produced the Avventura Concept, an Italian-flavored two-seat roadster built on a shortened Falcon chassis and aimed specifically at European buyers who wanted something sportier and more compact than the American product Ford was selling. The Avventura represented a real attempt to give Mustang-adjacent styling a distinctly continental flavor, years before Ford would seriously chase European sports car sensibilities again. Its European-only ambitions meant it was never seriously considered for the American market Ford already had locked up with the production Mustang.
The Mach 2, Ford’s Answer to the Shelby Cobra
Design chief Gene Bordinat and Ford’s Special Vehicles Group developed the Mach 2 as a spiritual successor to the Shelby Cobra, a genuine attempt at a mid-engine two-seater built around the 289 Hi-Po V8. It was one of the most performance-focused unbuilt Mustangs on this list, aimed squarely at buyers who wanted an exotic-car layout with Ford power underneath. On paper, it had the ingredients to become a legitimate rival to contemporary European sports cars. Positioning it against the Cobra rather than against ordinary Mustangs signaled just how seriously Ford’s engineers were taking the mid-engine layout at the time.
Why the Mach 2 Never Left the Auto Show Circuit
Cost killed the Mach 2 as a production car. A mid-engine two-seater demanded an entirely different platform and production process than the Mustangs already selling in huge numbers, and Ford’s business case never justified the investment required to build it at scale. Instead of disappearing, the Mach 2 lived on as an auto-show car, touring circuits for years and giving enthusiasts a tangible look at what a genuinely exotic Mustang might have been. Touring the show circuit for years gave the Mach 2 a strange kind of second life, more famous as a concept than most production cars ever become.
The 1994 Boss 10.0L: A Modern What-If
Decades after the Mach 2, Ford revisited the idea of a truly extreme performance Mustang with the 1994 Boss 10.0L Concept. Built around a 10-liter V8 derived from Boss 429 architecture, the concept was claimed to produce 855 hp and 790 lb-ft of torque, with a claimed 0-60 time of just 1.9 seconds. Those numbers would have made it one of the most powerful production cars in the world at the time, had Ford ever actually built it. Even as a one-off, the Boss 10.0L demonstrated how far Ford’s engineers were willing to push Boss 429-derived architecture when cost wasn’t the limiting factor.
The Mustang RSX and Ghia’s Rally Ambitions
Around 1980, Ford’s Ghia studio developed the Mustang RSX, short for Rallye Sport Experimental, built on the then-new Fox-body platform but with a wheelbase nearly six inches shorter than the production car. The RSX was designed with motorsport in mind, running a 2.3-liter four-cylinder with enough room in the engine bay to accommodate the turbocharged version of that engine, a serious nod toward genuine rally competition rather than a styling exercise alone. Shortening the wheelbase that dramatically wasn’t a cosmetic decision, it was aimed squarely at giving the car the agility a rally-bred Mustang would actually need.
Magazine Buzz That Never Turned Into Sales
The RSX picked up real coverage in period car magazines, generating enough enthusiast interest that it looked, for a moment, like Ford might actually greenlight a rally-homologation Mustang for the street. That never happened. Like so many of the concepts on this list, the RSX was ultimately cancelled before reaching production, leaving behind magazine spreads and enthusiast speculation rather than a car anyone could actually buy. The gap between genuine press coverage and an actual greenlight is exactly the kind of near-miss that makes automotive history books worth reading closely.
The Mustang That Almost Became a Station Wagon
Perhaps the least expected entry in Ford’s unbuilt Mustang history is a station wagon prototype, built using 1966 coupe running gear. At least one running prototype existed, proof that Ford took the idea seriously enough to build real hardware rather than just sketches. A pony-car wagon never fit the Mustang’s sporty image closely enough to survive internal scrutiny, and the project was cancelled before anything close to production tooling was ordered. A running prototype, rather than just a rendering, is usually the clearest sign that a manufacturer seriously considered a direction before ultimately walking away from it.
What These Six Dead Ends Say About the Mustang’s Direction
Looked at together, the Mustang I, Avventura, Mach 2, Boss 10.0L, RSX, and station wagon prototype show just how many directions Ford considered before settling on the formula that actually stuck: an affordable, sporty coupe rather than a mid-engine exotic, a European-only roadster, an ultra-high-power one-off, a rally homologation special, or a family hauler. Every one of these cancelled projects represents a fork in the road Ford chose not to take, and together they explain why the Mustang that did reach production turned out the way it did. Taken together, these six near-misses read less like failures and more like a record of Ford testing the outer edges of what the Mustang name could plausibly stretch to cover.
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Don Schultz
Alexis Tadeo Hernández
I would like on
Mitchell Brown Fugly!
I bet that would have been a fast grocery better!
Here ya go Ole Mann.
George Stancescu
George Stancescu el.milano y la ranchera estan fresquisimos
Well it was released as the Torino wagon
Robby Edwards
Mark Foster
That is 1 ugly car
they have a corvette station wagon too. it was 68 or 69
ha ha i thought that was a vega at first glance, thats cool
Lexy Ward
Like to see one not just a picture of one