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I have one on my 640GC. With the valves closed it sounds almost like your stock mufflers. With the outer valves open, it sounds good but does have drone. That's why M6/M5's have valve control. For a 650 you can get an exhaustmeister and control the valves by remote similar to the Meisterschaft ones. Any exhaust with all tips open all the time will have drone. Some people don't mind it but I can't stand it on my car.
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