Shelby GT500

Engine Overhaul

While punching out the 5.4-liter aluminum-block V-8 out to 5.8 liters, the GT500’s powertrain crew also updated the heads for better cooling, changed the camshaft profiles, added piston squirters and higher-flow fuel injectors, swapped the old supercharger for a larger and more efficient TVS unit that ups boost from 9 to 15 psi, and fitted a larger intercooler. The result is an extra 100 hp and 90 lb-ft compared to the 2012 model. The cooling system was upgraded to dissipate the excess heat, and a carbon-fiber driveshaft, upgraded clutch, strengthened transmission (with revised gearing), and sturdier rear axle were deemed necessary to cope with the extra grunt. To help the driver cope, the GT500 is equipped with an adjustable launch-control function.

For Corners, Too

With 650 hp, no bend in the road will be far away. To address those curves, the new GT500 gets optional electronically-adjustable Bilstein shocks. Part of the Performance package—which also includes a Torsen limited-slip diff and Recaro seats—the Bilstein dampers offer drivers a choice of Normal and Sport modes. If you intend to unleash your Shelby on a closed course, you might want to opt for the Track package, too. It adds supplementary coolers for the engine oil, differential, and transmission.