The Ford Shelby GR-1 is a front-engined two-seater powered by a huge 6.4-liter V-10 engine that develops 605 horsepower at 6,750 rpm and 501 lb.-ft. of torque at 5,550 rpm, plenty to motivate an estimated 3,900-pound curb weight. All that thrust goes to the 345/35R19 rear wheels through a rear-mounted, six-speed manual transmission. We’d estimate that performance is on par with others in this class, with four-second zero-to-60 times on tap.