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This is why it is so easy to get more power out of a turbo engine. The factory tune has to satisfy all the different parameters like altitude, octane level, clean/dirty air filters, temperature range, etc. Manufacturers opt for an average tune that makes everyone happy. If you are at sea level, can get high octane gas and are in a moderate temperature zone it's easy to get 20% more hp and especially torque without any hardware mods.
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