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The main reason for a tune is to gain hp by adjusting things such as timing a/f ratios and many other things. Car Manufacturers tune their cars very conservatively from the factory to keep people from blowing the engines up and such. Audi is very conservative I remember working on a buddies S4 or A4 and tuning the car different from the stock parameters and gaining like 40hp to the wheels. Most cars you can chip/ or change the ecu/pcm or whatever the car manufacturer calls their computer module and that new ecu will have different adjustments built into the new chip that add hp and such. That is the simpliest way I can try to explain it but it is very complex.
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