As a high-performance enthusiast, you've undoubtedly heard the phrase free horsepower bandied about. It means horsepower that is lurking within your existing combination, just waiting to be released.

Enhancing performance of the 6.6L Duramax L5P diesel engine that powers '17-to-current GMC and Chevrolet trucks is not an easy proposition. General Motors' calibration engineers have made it very ...

Before 1970, the GTO had to make do with a maximum of 400 cubes of Pontiac horsepower, and the famous Ram Air powerhouse family quickly proved to everyone that displacement alone isn't enough to win ...