14. Corvette CERV III
As you may know, Chevrolet has been playing with a mid-engine Corvette idea since the ’60s. However, in the early ’90s, it looked like they would finally present a roadgoing and fully production version. So, they revealed the CERV III concept in 1990, and it was stunning.
It was a proper supercar with a 225 mph top speed and 650 HP, which was impressive. Also, it came with all-wheel drive and special brakes. The prototype looked mature so everybody expected that Chevrolet would introduce the CERV III as a production model. But unfortunately, GM decided not to do that.