Nobody. That is custom. Looks they used two plastic elbows that you can get from vortech. With couplings it shouldnt cost you more then $75. check out superchargersonline.com. they should have everything you need for cheaper then you can get it anywhere else.
I am guessing that they just bought some plastic fittings from a hardware store and drilled two holes in the elbow and screwed/pushed them in and sealed them with some rtv. thats the only way I know how to do that and make it air tight. You can also use the plastic elbow that mounts up to the blower from a AFM boost pipe and rig up something to attatch the air filter.