Balance tube would work if the entry for the balance tube was in the previous location of the wastegate. You must put the wastegate in a branch of a Y with the bottom leg of the Y feeding the two upper legs of the Y. Right leg of the Y goes to the turbo. Left leg of the Y goes to the wastegate or in your suggestion: balance tube/wastegates.
That would be the plumbing for one side of the engine.
Tom Vaught
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"Engineers do stuff for reasons" Tom Vaught
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