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a tune on its own can gain varyingly different amounts for different cars. with all stock parts, you might be able to see about a 30hp gain from just a tune (at least with the A6) now, we've already seen intake and exhaust on these cars gain 10-30 hp without a tune, with a tune, you can bump that up another 5-10hp in some applications.
as far as what happens with a tune, there are a lot of things, from changing spark timing advance, to adjusting fuel maps, deleting unwanted things (such as CAGS, torque management, etc), changing the rev limiter, shift points (auto), speed limits, shift pressure, cooling fan on/off temps, and some other stuff that I cant think of off hand.
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