I love everything that you have done to the car! East coast people seem to know how to mod their M3s oh and Europeans. So far the west coast is lacking in the classy look from what I have seen so far.
Only thing I would remove on the coupe is the tow hitch. If you are not at the track then don't put it IMHO. I see tons of STIs EVOs japanese cars etc.. with a tow hitch in the west coast... Don't ruin the front end of the M3 with it.
But if you like it then by all means leave it. Just letting you know most people would wonder "wtheck is that"