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basically a small pneumatic pressure regulator which air then forces the acuator to move the flapper vavle in the exhaust housing to open
the lighter the spring tension, when boost flows into that part of the system, the air pushes the spring and ball deal so air can pass through the controller and to the acuator and move the flapper valve, thus the more spring tension set on the mbc, the more boost it will take to pop the valve open, and opening the vavle and thus making the boost rise.
i guess you can say its similar to adjustable blowoff valves, but used for a different purpose..
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