No, the only mods I've done is getting rid of the EGR stuff, and since this pic I've added an intake and had it rejetted for that and the pipes. It runs fast enough to get me in trouble :biggrin5:
IMO I would stay away from BullyDog. Like GMCTD says, your foot controls alot of your fuel economy. On the CTD if you will keep the RPMs under 1900 you will see a good jump in your MPG's. You can also take a look at Edge Products new Mileage Max module, there are quite a few guys running it...