Turbo boost controls

In modern turbo engines the boost is controlled by a wastegate. This can be either an integral wastegate that is part of the turbocharger (usually the case in factory turbo applications), or an external one. When boost is applied to a diaphragm in the wastegate actuator, it will open a valve that lets
exhaust go past the turbine wheel.  One can raise the boost from stock setting by:

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