Not 100% sure. Probably to keep the airflow a little bit more laminar. The nismo nose is longer and they don't want air curling around the front bumper support. It's not a big deal to remove, if you are putting the g3's on, and if it does cause a problem you can always rivet them back on. I pulled mine off to put on the nismo front brace. Had to cut a slot in them to make it fit and then riveted them right back on.
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