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You could do the zip-tie mod. Look underneath the exhaust and there should be a "valve" connected to a tube. Undo all the screws then zip tie the end of the valve toward any nearest "hook" or any openings. Go with a high-temp zip tie if you're concerned.
I did a zip-tie / golf-tee mod on the 35i and it sounds wonderful.
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2019 X3 xDrive30i (anytime now)
2016 X3 xDrive35i
2013 X5 xDrive35d Sport Activity
2011 X5 xDrive35i Sport Activity
2007 X5 3.0si
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