Well, you are about halfway there.
It is actually adjacent to the TB, on the left side of it looking at the driver's side of the engine from the front quarter panel.
With the air intake stuff out of the way, you will be staring at a gray box bolted to the underside of the intake manifold. It has wires going in and out of it - they go to sensors. Unbolt that and push it aside. You will most likely need to disconnect the sensor connection at the adjuster unit (black butterfly stuck in the intake manifold) to do this, and maybe one or two more. Don't worry, they all only logically reach what they are supposed to go on, so you can get them back on.
With that out of the way, you should be able to see the bottom of the separator. Don't get too excited. To actually dismount the thing from it's hidey hole, you need to pull the throttlebody off. There are 4 bolts, and you more than likely removed one already to get the little gray wire box off - they share one bolt. Once you pull the TB off, you can get the second screw off that holds the separator to the underside of the intake manifold. Really, you could bust the separator in half and get it out before you pull the TB, but you can never gain access to the second screw until you get the TB off; no tool I know of can under a screw in that little space. You will see what I mean when you find the separator.