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Supercharged/TurbochargedThe increase in air/fuel pressure above atmospheric pressure in the intake system caused by the action of a supercharger or turbocharger attached to an engine.
It's a very nice design. The pipes might not be equal length, but as long as they are close to a perfect ratio (ie: rear exhaust tube is 2x the front one) the exhaust pulses will alternate and spool the turbo nicely.