2004: Exhaust exits on left side rear only, 5.7 LS1, no hood scoops, cable throttle body
2005/2006: Split dual exhaust, 6.0 LS2, hood scoops (unless ordered without), drive by wire TB, bigger brakes, beefier (relatively) driveline
2006: Blacked out tail lights, lit steering wheel controls, door lock button on console
Of course, mixing and matching parts between years is popular. Lots of people put to 2006 tail lights on other years. '05/'06 scooped hoods are popular to put on '04s. I put the '06 lit steering wheel controls in my '05. There's a kit out there to add the console door lock button to '04/'05.
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