The '03 came w/ an extra fuel pump, the '04/05 didn't. The 03-05's came with bigger injectors though. I would assume Vortech knew what there were doing when the designed their kits. But I did install an EGT gauge to watch for a lean condition. I filled out the Nelson custom tune request. Sounds like he's the man to make my truck run like it should!
Colby
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