Thanks everyone for the comments
My car is Space Gray for those that are curious, it's the lighting and editing that give it that brown concrete color in the photos. I will also try to get a video up for it if I can.
So as far as a small review since installation, It's been a couple of days now, and I am in love with this exhaust. Yes it is a little loud at times, but I am happy with it 97% of the time. The only time it bothers me is leaving/coming home when I have to deal with 7 road bumps....
But... that is annoying no matter what
My GF also does not think it's obnoxious or too loud either. So as far as being a DD, it is better than expected. I can't imagine myself ever letting the exhaust go. It's just that good. Honestly guys, the way this exhaust sounds whether on the gas or coming to a stop at a light is extremely intoxicating. I am very picky about my exhausts, I hate too loud or obnoxious or not the "right" note for the car, but this creates such a good tone for the beast of a machine that the M3 is.
If you are on the fence whether this works as a DD or not, take it from a guy that drove with the M Performance Exhaust for 18 months, the Eisenmann Race exhaust works brilliantly as a DD.
Anyways, thanks again for the comments!
Oh and yes... When the unicorn diffuser becomes available again. It will be on the car.