Hellcat has pushed the limits of American muscle, producing monstrous powerplants with horsepower numbers once thought unthinkable. Here are the coolest ones.

The reason is unknown, though the Hellcat-powered pickup truck has only 9,000 miles on the odo and a clean Alabama title ...

The legendary Ram 1500 TRX may be gone, but one Atlanta-based tuner has built a version so powerful it makes the factory ...