Quote:
Originally Posted by gixxerboy63
My buddie's X5M moves the exhaust flap open or closed, depending on whether it is in M mode or not. My exhaust valve does not care and does not seem to be controlled by the M button, rather it seems to have a mind of its own...
I want to push the M button to make it open and close my exhaust valve, but it doesn't...
I wonder WTF is going on?
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Have you looked underneath to make sure the vacuum lines are still attached to the exhaust valves? Check for cracks in vacuum lines as well as tight fit.