This is the Chaparral ZX concept, and it was designed by GM in collaboration with Gran Turismo Vision GT. It was unveiled at the LA Auto Show last month.
"The Chaparral 2X VGT’s concept propulsion system is inspired by technology derived from advanced work targeted at space travel and future aircraft design," described the design team at GM. "It features a mid-mounted laser beamed-energy propulsion system, which pulses beams of light that focus in a shroud, creating shock waves that generate tremendous thrust in the lightweight race car."
Check out a video below: