Well it looks like Rook's 2007 Xterra K.H.A.O.S. Edition. He hasn't been on the site since 10-08-2015 @ 05:44 PM so updates to his rig haven't been documented on his build thread.
I was referring to the silver one on the right. Looks pretty stock with a few minor mods. And I think it could've been a female driver. Not sure though.