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And I might add that the outer set of secondary throttle plates can come in handy especially on a series four non turbo engine converted to turbo. If one uses the stk turbo on that configuration and deletes the twin scroll......the car will bogg down and have less torque than a non turbo engine til you get the rpms up over three grand. But if you run a vacuum line to the double throttle diaphram the outer set will stay closed til you virtually get into boost, thereby increasing the low end torque. Makes the thing driveable in the neighborhood when just going to the store to do shopping i.e. normal drive situations. Thanks to a kiwi named Bumpstart for that idea.
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