Why would the exhaust note be different in power mode? Does their tune change something else than throttle response in that mode? If I'm not mistaken that's the only difference in sports mode with the stock tuning.
2015 M3 6MT Stripper | Yas Marina Blue, Cloth, CF | Adaptive M Susp, 437M
2013 X5 xDrive50i | Carbon Black | M Sport + M Perf, 333M Wheels