Throughout the existence of the Acura NSX, it has been a supercar that has stood out as a flamboyant exotic vehicle. A highly-distinctive performance addition to the Acura line-up in 1991, the NSX was instantly noted for its speed and technological prowess. The early Acura NSX was noted for extensive aluminum construction for the chassis and body as well as for the introduction of Honda's VTEC (Variable Valve Timing and Lift Electronic Control) engine technology to the United States. Originally a hardtop, the NSX supercar later adopted a targa top removable roof panel in 1995. In 2002, the Acura NSX received another major change with a revision that most notably resulted in the fixed HID headlights. Production of the first generation Acura NSX concluded in 2005 but the appetite for the supercar remained strong enough to encourage a new model for the 2017 model. Powered by a Sport Hybrid Super Handling All-Wheel Drive system permitting a maximum 573 horsepower from twin-turbocharged gasoline engine and two electric motors, the second generation Acura NSX also touts other advanced technologies found in a new supercar era such as a 9-speed dual clutch transmission.