I just meant for cutting the bumper support, only an inch or so, it doesn't actually do anything as far as support since it's such a small amount (I'm sure there is a very slightly small amount of stability loss if your going to nitpick, but really it's nothing) I just did that so that you can't see the bumper support from the grille.. I just personally didn't like the look of being able to actually see the bumper support, most people don't want to go through the hassle of doing it, but I wanted to make mine look flush and I'm glad I did it that way, I wouldn't do it any other way, and actually I might fix my brother's but his is mounted differently so might not both with it.
but ya, don't need to if your IC is small enough, just figured I would give a suggestion with my personal experience