Bully Dog Tuners for 2011+ Chevy and GMC 6.6L Duramax LML LGH diesel trucks. Bully Dog's GT tuners are incredibly popular with the diesel enthusiast community. They are a remarkable four-in-one performance product that provide: a vehicle engine tuner, monitor, gauge display, and diagnostic device all in a single unit. If you want more out of your truck, whether it's for sport, competition or towing - you can't go wrong with a Bully Dog at the helm.
