I have yellow fogs on mine and to be honest it is for looks BUT compared to the xenon white fog bulbs the yellow is more functional. the extreme white of the HID can wash out things in fog or heavy rains/snow, but the yellow helps to give you a little more color on the road to help sharpen things up.
Love mine, H11 Hoen Endurance Yellow.
Looking good in the snow, I always rock parking lights + fogs
