Race Proven. Quality Assured. Owned and operated by Mitch Payton, Pro Circuit is a custom precision engine building facility. Pro Circuit's owner has invested over 25 years in engine building and machine shop techniques. Having had the privilege to work with the most talented riders in the industry has allowed Mr. Payton to develop products and services that perform. This investment has qualified him to design and build your motorcycle or ATV, whether used for sport or race, to outlast and outperform the competition. His technical ability and precision is using flow bench and dyno technology coupled with countless hours of field testing and racing, produces results. Many tuners, in building their machines to compete disregard longevity and dependability, to the dismay of their budget. At PC, special attention provides dependable high performance service. Our goal is to get you the most for your money.