Pontiac Dream Car - Bonneville X-400 convertible.
For those of you not familiar with the X-400s, they were a series of Pontiac convertibles customized by GM Styling for show use. New models appeared in 1959, 1960, 1962, 1963, and 1964. The first two were Catalina-length Bonnevilles and the latter versions were Grand Prix convertibles-none of which were available from the factory.
The X-400s represented the outer limits of Pontiac-style, luxury, and performance, with supercharged Pontiac V-8s, custom interiors, and enough one-of-a-kind features to impress even the jaded enthusiasts of today. They boasted such high-tech goodies as a rain-sensing, automatically operating convertible top, driver-operated exhaust cutouts, and full gauges, right down to custom but stock-appearing 160-mph speedometers.
Source: Internet
