Yes, probably just a simple tune. Changes to your tune beyond that carry risks, extra costs and quite possibly new engine hardware. A new, more aggressive camshaft, LS3 intake manifold, headers and higher compression heads could really wake up that engine but would be big dollars . . . and an all new tune.
Changes can be made for more aggressive engine timing but this can be risky and make the engine run hot. It will also absolutely require the use of 91-93 octane fuel - 87 octane won't be good for an engine with aggressive timing. That 4L60E also won't tolerate high power for very long.
I have your exact same engine and transmission combo and all I have is a good base running tune. And a dependable running engine with 20-25 MPG fuel consumption and wouldn't change a thing.
Rick
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