Bully Dog was formed in 1998 in Aberdeen, Idaho. The founders of Bully
Dog – Michael, Phillip, and Daryl Klassen --were heavily influenced by
their father Harold's interest in improving vehicle performance. In 1998, Bully Dog's owners took this concept and developed and patented
a safe and effective propane injection system to enhance diesel engine
Bully Dog's quest was now to be recognized as the leader in the diesel
performance industry, which motivated them to stay abreast of new
technology in this industry. In 2005, the company expanded its range of products to include performance products for gasoline powered vehicles.