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You got it.
The vacuum cans need vacuum to close the exhaust valves (quiet mode). By default they are open.
I do not know what percentage is required throttle wise to start them opening. But yes if you start accelerating pretty good they will start to open and continue opening wider if you keep feeding more throttle. The amount they open is variable based on load (engine vacuum reducing) and can be at any given position based on "X" amount of vacuum. If you hammer it off the line, they will be wide open until you reduce the load. Exhaust flow on demand.
You could drive around conservatively and they may never open or you could have them opening and closing with each acceleration/deceleration or if you want them open all the time, just break the vacuum circuit by opening the manual switch.
I think the production NPP cars have some circuitry in them that also gets involved with controlling valve position based on rpm. This may be for assisting with more bottom end torque but I am unfamiliar with them.
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