I tested this earlier after reading this thread. The M exhaust sound button works in all three drive modes - either in Efficient/normal, Sport or Sport+ mode. I heard the difference, although notably less in the normal efficient mode - but still a change when engaged. It gets more pronounced in Sport and Sport+ mode - obviously the loudest/deepest increase resulted in Sport+.
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22 G80 M3 Comp xDrive
23 G80 M2 MT
24 G05 X5 50e
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