2004 RX-8, where does this solenoid go?

I've searched but can't find an answer and alldata is no help. I've got a metal vacuum solenoid under the airbox that is plugged in to the electrical harness near the MAF sensor but both ports are connected to short lengths of vacuum hose and nothing else. Where should this go? It looks like an EGR solenoid but I can't find any info on it. It's not one of the main 3 solenoids under the UIM. Forgive me if it's a simple question, I'm a BMW guy and just trying to help a friend. I'll link to a picture since I can't get photo upload to work. Thank you.

http://ift.tt/1VjXFPH