Companies show great concept cars, generate a lot of interest and then don't build them. What's up with that? Here are a few I wish had gone into production.
1954 Chevrolet Corvette Corvair. Yes, it was called the Corvair 5 years before the more familiar rear-engined air-cooled Corvair came out. The C1 Corvette was only available as a roadster without roll up windows. A fastback Corvette would have been more practical, but still fun (if it had been introduced in 1955 so it would have gotten the 265 V-8 and a 4-speed manual.)
1959 Porsche 754 Typ T7. Porsche started working on a replacement for the 356 as early as 1956. The 754 was built to investigate the idea of a true 4-seater Porsche. The styling was by Butzi Porsche who designed the 911 a few years later. The front end is almost identical to the 911. Ferry Porsche decided he wasn't prepared to enter the sedan market, so it never went into production. It's a shame, because I think it's a sexy little sedan and it could have been very successful with people looking for a little more interior room.
1998 Plymouth Pronto Spyder. I've always loved the look of this little mid-engined sports car. Unfortunately, with Mercedes-Benz buying Chrysler, the Plymouth brand was shut down and the Pronto Spyder didn't stand a chance.
2001 Suzuki GSX-R/4. What a great idea. Take the engine from a Suzuki GSX-R1, and then wrap the absolute minimum bodywork around it to carry two people. Plenty of power and it weighs next to nothing. It's like a Japanese Super 7. What a great track tool it would have been.
2003 Subaru B9 Scrambler. Why, Subaru? Why tease us with such a sexy little sports car and then not build it? You're so cruel.