The main part that needed modified on the bumper was about halfway down it needed cut away from the wheel about an inch (I think) on both sides.

It's not super noticeable with the lip on, but if I ever wanted to get rid of it the bumper would look funny. Also a few pieces on the lip in the middle needed shortened.
For me the end result is worth it, especially since I was never crazy about m3 bumpers anyhow.
__________________
"I would not know what the spirit of a philosopher might wish more to be than a good dancer."
- Friedrich Nietzsche

1980 635csi Euro . . . Current
1985 535i . . . Soon to be parted out
2001 Subaru Forester . . . DD