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The answer you don’t want but are looking for is it opens only when driving, in sport mode and at a certain RPM ( I have heard people say 3,000rpm but I havnt confirmed).
Only way to open exhaust valve is to remove the motor controller on the valve, and manually open the valve then secure it so it doesn’t close.
When doing the same research and realized this was the answer, I gave up as the sound difference wasn’t worth the hack job.
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