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The valve defaults to white (closed) mode on start up. If you have the vacuum lines from the front of the engine bay hooked up to the wireless kit in the trunk, and ultimately the flapper on the muffler -- and the only thing you do not have hooked up is the power to the wireless transmitter, than the flap is closed.
There's a chance you might need to adjust the arm on the muffler, in the event that it isn't sealing. But I think the factory setting is fine..
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