Might be the same set up as my 335 coupe. There is an exhaust valve that opens the passenger side muffler after like 3-4K rpm's. There is a wire you can unplug in the 335 that opens the valve up and gives you a nice rumble echaust tone. Have not had any issues with it, not sure if they have that on the X6. Look into the Golf Tee mod
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2013 X6 - retired
2015 X6 - retired
2015 435GC - retired
2018 X5 40e - retired
2020 X5 M50i - Current
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