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The e9x m3 drones between 1900-2100rpms and 2900-3200rpms depending on the exhaust. Even the stock exhaust will put out a frequency that would be considered drone.
There is no doubt the chambers help to greatly reduce this drone on this system, specifically between 2900-3100rpms. Especially compared to some of the other exhausts in the same category regarding volume/tone. However, at 1900-2100rpms there is still a lower frequency that many would consider drone, specifically if you are going up a hill. In this case a simple downshift fixes that.
I would put this system right in the middle. It doesn't drone like a race eisen or gintani would but has plenty of volume and a nice exotic tone. At the same time it's not too quiet like a corsa or eisen sport would be. If you're interested in coming by to hear it, or if you want some videos feel free to let me know
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