Hennessey Performance is an American automotive company known for modifying and enhancing high-performance vehicles. Founded in 1991 by John Hennessey, the company specializes in tuning cars, trucks, and SUVs to achieve greater speed and power. Their modifications often include engine upgrades, aerodynamic enhancements, and custom styling. The company has gained recognition for its work on various models, including the Chevrolet Corvette and Ford Mustang. Hennessey Performance also produces its own supercars, such as the Hennessey Venom GT, which has set records for speed. Their commitment to performance and innovation has made them a prominent name in the automotive industry.