The Pontiac Banshee is a line of concept cars designed by Pontiac. Beginning in 1964 they assumed the role previously established by General Motors' Firebirds of the 1950s. Four Banshee "dream cars" were fabricated through 1988 as design exercises intended to establish exterior and interior themes that could be modified for production versions of Pontiac sports and performance cars.
Banshee I
In 1964 Pontiac unveiled their newest concept car, which they dubbed the Banshee. During its development it was called the XP-833 project. This car was a small two-seater with a long, sweeping hood and a short rear deck. Several different versions were constructed, but only two drivable prototypes were ever built. One was a silver hardtop with a straight six engine and the other is a white convertible with a V-8. Both survive today and are in the hands of private collectors. The silver hardtop version of the Banshee can be seen in the classic car section of Napoli Indoor Auto, In Milford, CT.
The styling on these cars is highly reminiscent of what appeared on third-generation Chevrolet Corvettes in 1968. Another styling cue that made production was the design of the taillights, which are nearly identical to that found on first-generation Pontiac Firebirds. Indeed, the high performance and sensuous styling of the Banshee may have led to its demise. Head of Pontiac John DeLorean called this car the "Mustang Fighter" and rumor has it he fully intended to bring it to production. However, his bosses at GM felt that it would be a threat to the Corvette, cannibalizing its sales, and (if DeLorean had his way) outperforming it as well.
This did not sit well with GM execs who had marketed the Corvette as their top performer; even today, recent models such as the Camaro and Firebird - even though using the same engine as Corvette - have those engines de-tuned slightly so they will not have as high a horsepower rating as a Corvette. The Banshee would have had equivalent horsepower, yet weighed 500 lb (227 kg) less than the Corvette and so would have been a potent package. It was able to reach 60 mph (97 km/h) in second gear. GM executives instructed DeLorean to cease further development in 1964. In a move loaded with irony, a memo to GM's head of design, Bill Mitchell, dated September 10, 1965, instructed Mitchell to have his staff update the XP-833 exterior clay and interior bucks “reflecting a Chevrolet design for the two-passenger version coupe." And so it was that the XP-833 project was revised to become the C3 Corvette against which it had been forbidden from competing.
Source: Wikipedia