well, uh... um.... good for you?
I'm guessing where you're at doesn't have state emissions or inspection.  It's against federal law to remove your cat on a street-registered vehicle.  Not that I personally care about removal of the cat, but if you have to get inspected and go to the wrong guy, they might.
I still haven't seen/heard a bmw in my area with a loud exhaust of any sort.  I think it would be funny.  I'll probably end up being one of the first around here, when the time comes.