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As I understand it, the butterfly valves are for torque control to maintain torque at low and high RPMs.
Of the three valves, I believe that the first is open pretty much all the time. The second (or Low Intake Air Bypass) opens above 3,400 RPM, and the third or High Intake Air Bypass valve opens at 4,300 RPM. These are Type II specs. The Type one opens the low at 3,300 RPM, and the high at 4,000 RPM.
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