OK, now I feel retarded, I received an Xmas gift from the family. After I told someone that I wanted a plenum for my 97SR20det. This is what I received all wrapped nice. When I opened it in front of the family. I pretended to be excited. The reason is that it does not look like the greddy's that I have seen. I am not sure if it is fake or not. Also.

Why does it have the circles and what goes there? Plus there is threaded holes cut in the back of it beside the firewall side. It came with all the proper paperwork and attachments but I am lost, someone please help me