So I still don't know what that fuckin button really does. I've tried it, and I hear a change in sound, but I'm not sure if it's manipulating valves or just changing the piped in sound. To me, it should be a simple 1 and 0 button, valves open or valves closed, but I'm sure the Germans put a lot more engineering into than that.
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Current: 2024 BMW X3 M40i.
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