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I have same question about the valve control on stock exhaust, I even took it to dealer about it.
As my X5M inner valve doesn’t open when M button is pressed, SA and shop foreman told me that it doesn’t work that way.
They told me that it never opens instantly when M button is pressed, it’s actually controlled by the back pressure.
Is this true? Anyone here with stock X5M exhaust that valve opens instantly when M button is pressed?
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