The Eisenmann Race is not JDM aftermarket exhaust loud, in fact it has a very nice sounding growl. I've been running this system for almost 9 months now and I still love how it sounds.
Here are clips of the Race and Sport system for your comparison
Sport (on ///carbon's Z4) -
Race (on my own Z4) -
The difference between the 2 are the noise level, the tones are pretty much the same.