2005 1500 hd with 6.0 gas

what is the difference in this and what is in caddy, hummer, and others, do they have other cams or what to give the 345 hp or just computer. can i just reprogram. the teck at the dealer said just run eathel gas.

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It's just the program. That plus the premium fuel reccomendation. The engines are identical.
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