Just to clear, a 6" truck will NOT have more travel than a 3" truck. You will need a bump spacer, which will in turn, leave it at the same travel as a 3" truck. Good lookin truck, by the way! ^^^
The 6" carli systems do in fact increase travel over the 3" systems. The 6" has a 60% travel increase over stock, while the 3" systems have a 50% increase in travel over stock. Even though the 6" kits have bump drops, travel is stil added over both stock and the 3" system.
2500 qcsb 4x4: auto, yukon hubs, Fass, 2mic Cat/baldwin 5mic FWS, 20" Trail Ready wheels & 37's, Edge insight, custom retroshop, heads/tails, Carli Dominator, Amp steps, Smarty JR 1993
D350 5spd, HID projectors, 4in TBE