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Variable geometry or two-stage intake manifolds are used to optimize the torque at all engine speeds by directing the intake air to different length runners. A manifold tuning valve (MTV) is the control mechanism that accomplishes this by directing air at low speed through long runners and air at high speed through short runners. The MTV actuation is through an electric motor / rotary solenoid controlled by the engine controller through a relay. Hope this helps! Jay

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17y ago

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