I am looking for a factory tune for an 03-05, I just need a base to revert my 06 to so I can start with to build a turbo tune, if someone already has a good turbo tune I would be much appreciative to get one as well. I have an 06 silverado, 4.8, 5 speed, custom built forward mount turbo, 2 bar map and 56# injectors if that helps any. thanks.