Quote:
Originally Posted by gthal
I had always thought this to be true BUT I can attest to this NOT being what I hear. Sport and Sport+ mode sound VERY noticeably different in lower RPM and lower gears than when the valves are disconnected. Give it a try yourself and see what you think. My car is noticeably deeper and louder as I pull away from a stop than it was in Sport mode. I wonder whether the valves are partially closed? All I know is the car sounds much deeper and louder than Sport mode.
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It seems that BMW never gives all the details when explaining their active systems.
Based on 3,000 miles of driving prior to pulling the plugs, I am certain that the valves are constantly tweaking based on some insane amount of research that is designed to eliminate every possible moment of drone, regardless of mode.
The car is undoubtedly louder at low RPMs most of the time with the plugs pulled.