Bully Dog Technologies has developed the premier system that increases horsepower, torque and diesel mileage! When propane is used properly, it will keep your engine cleaner with less carbon buildup and cleaner oil. Propane is a high-octane fuel and burns slower and longer therefore, propane will help diesel burn more thoroughly, increasing power and torque. With the Bully Dog Adjustable Diesel Propane Kit your engine should last longer, get better fuel economy and have significantly more power. By fumigating the intake air with propane, there are dramatic increases in power, torque and d ...