Recently, I've been working on installing 12 inch subs to my 2020 base wrx. However, I'm wondering just what this black box is that sticks down from the trunk. It's directly behind the rear passenger seat and in order to get my subs to clear that box needs to go. It looks like it just snaps in but the harder you pull the more it laughs at you. I assume it is there to protect the wiring harness for the back window. Also I don't want to just go cutting into it. Ideas?