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This is most common with turbocharged or supercharged engines.
Basically, a turbo or supercharger is like an air compressor that injects highly compressed air into your engine so that you can burn more fuel, and therefore, create more power.
A tune is usually adjusting the levels of air compression (boost), the amount of fuel (over various RPMs) and the timing of a few other things to make the engine produce more power.
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