Hennessey Performance Engineering is an American automotive company known for modifying and enhancing high-performance vehicles. Founded in 1991 by John Hennessey, the company specializes in tuning engines, improving aerodynamics, and upgrading various components to increase speed and power. Their modifications often focus on brands like Chevrolet, Ford, and Dodge. The company gained fame for its impressive performance packages, including the Hennessey Venom GT, which once held the title for the world's fastest production car. Hennessey also offers a range of aftermarket parts and services, catering to car enthusiasts looking to elevate their driving experience.