Bully Dog Technologies' Bully Dog Cat Power Pup downloaders can help increase fuel economy and power on 1999 and newer Caterpillar 3406E engines that are controlled by the ADEM III and ADEM IV ECMs. The downloaders feature two tuning options: Economy Tune - designed to provide maximum fuel efficiency and a small power increase, and Power & Economy Tune - designed to produce approximately 15 percent more power to the wheels while also providing increased fuel economy. The increased economy is the result of creating a more thorough, more efficient burn within the engine, according to the company.