Might have a slight increase, the F10 is so sound proof from the rear that I find it quit except able and contemplate electric cutouts like I had on my M3 or a muffler delete. I will wait for the down pipes before I go overboard.
Mine sit 1/2" past the bumper with the centers, They sat 2" past without.
Your video just reminded me why she only did it once I got the centers within the same week.
Aloha
Alex