u/Formal_Stage7515

I hate to make this post because I’m trying to do everything on my own, however I am completely lost. I ordered the oem kicker subwoofer and I’ve been watching videos and searching online for how to install it. Everything I’ve seen tells me what to take apart but not how to hook anything up. My main concern is the wire harness, I have no idea where it’s supposed to plug into and everything I’ve found in the car so far doesn’t match up in plug sizes. Idk where to look or where to go for answers so any help is appreciated.

For context I have a 2013 wrx, and I’ll try to answer any questions I can. If pictures are needed, I’ll try to provide them.