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Subies and most of your factory turbos come with a BOV not the best ones but they do have them. When it comes to the BOV the best setup is for you to have the BOV recirculate into the turbo. Turbo's need air to spool by keeping the air in the system it helps to keep the turbo spooling and that equals less load on it.
As for me my turbo is fully spooled at 3K RPMs and unless I'm in a hurry I shift before I hit any boost. That way the ECU stays out of the closed loop and isn't dumping extra gas in.
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