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still the internal wastegate is a single flapper only the port is split, so, you should be able to run a single external from the collector, as long as you tap into each half of the system.
Remembered this while I was in the garage this weekend. So I decided to take a look at the turbo. here's what I saw.
So each side remains totally seperate until the wastegate opens. Thought this was pretty interesting and wanted to share.