I can comment on how load it is. I've seen Cptn Mos, or rather "heard" his car in action.
Its VERY LOUD and you will no doubt attract the attention of the cops.
so if you get it, you take your chances....
For me, driving a M car already gets enough attention, good and bad. Why do something that will no doubt put you in a cops cross hairs? To each his own, just don't write a thread complaining about how a cop pulled you over for a loud exhaust as I'll just refer you back to this thread...lol