D&J Precision Machine stands as a powerhouse in the diesel performance and racing industry. D&J’s commitment to innovation and excellence is clear in its Cambridge, OH, headquarters, where precision machinery and craftsmanship produce top-of-the-line components. Led by Founder Drew Pumphrey, the D&J team embodies the same drive and passion that fuel our products. If you’re looking for a racing engine to unleash unrivaled power, you’ve come to the right place.