DRL was changed to the high beam bulb in MY2008.
Another "lighting" change that was made was to the map lights. In the earlier 3rd generation (2005-9) Outbacks, the only overhead cabin light that comes on when a door is open is the dome light, which is fairly far back, especially on cars with the moonroof. So there's very little light in the front seat area. In 2008 or 2009 the two map lights over the rear view mirror were added to this function so that they too come on when a door is opened.
