The Buick Regal is a favorite for many classic car enthusiasts, and its Grand National variant became a legend as a result of its intimidating appearance and high-performance turbocharged V6 engine. Some purists would say the turbo V6 is the heart and soul of the GN, but what happens when one of these cars is built from the ground up to go toe-to-toe with modern supercars? That's a question the Hemmings crew set out to answer as they built a supercharged-V8-powered Grand National for Grammy-award-winning rapper Killer Mike.