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Yup, I get the same "symptom" with a Dinan Stage 2 ECU and Berk sport exhaust. It happens consistently when I'm cruising and the throttle is held in the same position... after about 10 seconds the exhaust note changes to be lower, deeper and louder. It goes away if I add more throttle, or if I back off for a few seconds.
I never knew what caused it, but I considered it normal operation because it is so consistent and doesn't affect driveability.
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2010 Le Mans Blue 135i 6MT - BMW Performance, Dinan, Koni, Eibach, Berk, Breyton, BMS
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