Explore high-quality racing components, made in the USA by DMI and Bulldog Rears, part of Diversified Machine, Inc. These top-quality driveline components are manufactured for short track sprint racing. Diversified Machine Inc. began in a two-car garage in Lancaster, PA, but expanded when the company made moves into the sprint car racing industry. The DMI product line focuses on creating high-quality racing parts and components at fair prices, while the Bulldog line’s innovative concepts have greatly improved quick change rear ends.