2008 Ford Mustang Shelby GT500 KR King of the Road. Powered by 5.4L supercharged V8 engine producing 540 horsepower and 510 LB-FT of torque and paired to a 6-speed manual transmission. Of total production in 2008 (1,011 units) around 328 were finished in black. The new KR, like the original, is essentially a GT500 that's spent another hour or two swimming in the testosterone pool. The supercharged V-8 benefits from a new cold-air intake and a Ford Racing low-restriction exhaust. We also tweaked the spark maps a bit, says Jamal Hameedi, SVT chief nameplate engineer.