Yes, he does but the lack of a link to the information you are referring to does not help as much. Here is a direct link to what Vince referenced: Can I convert my halogen headlamps to HID? Source & More information: http://www.subaruoutback.org/forums/104-gen-4-2010-present/42731-2011-outback-low-beam-hid-kit.html. Great quality pictures on that thread.Daniel Stern knows all about lighting.
Take the Halogen bulb out and put in the HID bulbs with the adapter to fit the bulbs they replace. The HID bulbs are usually D1S, D1R, D2S, D2R, D3S, D3R, D4S, and D4R. While halogen bulbs are 900x, Hx or HBx (x = number).What exactly does "swap out" out mean?