Ford CEO Jim Farley tells the story behind Jay Leno's Mustang GTD. The 815-horsepower supercar was designed to take on Porsche.

VMP Performance improved its supercharger upgrades for GT500s and Raptors. APEX Predator gear improves airflow, cooling, and horsepower.

The S650 Dark Horse and the S550 Mach 1 go head-to-head. A final verdict is reached after a dramatic crash.