Acura 2009 NSX Advanced Sports Car Concept

It only had 270 horsepower and the interior of a Prelude, yet the 1991 Acura NSX was still an exotic. To keep weight down, aluminum was used for the body, chassis and suspension. Instead of more traditional V8 or V12 power, the NSX used a mid-mounted 3.0-liter V6. What it lacked in displacement, it made up for with variable valve timing and titanium connecting rods, the first ever in a production car.