many pics have been posted of M3s with the M performance rear spolier, but I couldn't find many that really gave you an idea of how dramatic a piece it actually is (for those who haven't seen one in real life).
It is a very dramatic piece and really gives the rear of the car a much sportier look. Being OEM, fitment is spot-on. I used the BMW Betalink adhesive.
So here are the pics...hopefully they capture the true details of the piece for those who haven't seen it in real life:
It is much "steeper" than it looks in most pics
Here's one in comparison the the standard trunk lip:
Hope this helps if you are thinking about this mod