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Welcome to the forum! Without going too far off topic, I installed a Supersprint race exhaust on my Z4 3.0i and don't consider it loud at all. It's nowhere near the volume of the Diablos the OP has (which I have on my M). The Supersprint setup consisted of a Y-pipe (resonator delete) and muffler. If you have aftermarket headers, the exhaust will be much louder. I find the Supersprint race setup on the non-M to be tame... pretty much perfect for daily driving. My Diablos doubled in volume when I swapped in aftermarket headers and race cats, so I would assume the standard Z4 would also see a noticeable increase in volume.
OP, I'm interested in how much drone the hangers reduced. Can you give an estimated percentage?
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