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Bully Dog technologies has grown from its beginning days as a propane injection company to a dominate force in the tuning industry. From the packed with features PMT to the sleek and informative GT tuner they have a solution for your gas and diesel tuning and monitoring desires.They also have the all new RFI injection molded intakes and ceramic coated exhausts among other great solutions for your performance needs such as Agriculture tractor modules, Mercedes and VW modules as well gauges, tuners, injectors, propane, and nitrous kits. Check them out and see why they are the lead dog.