Personally I see no point in wasting money on a cheap hid kit setup for my fog lamps. At that point (if it comes) I will just buy matching halogen bulbs. They wont be close but I would get a superwhite color to them, and save my money.
HID fogs make pretty much zero sense, but hey thats just me.
If you want to upgrade your light output, upgrade your low beams to either a projector retrofit, or oem HID upgrade.
2009 ///M3 Space Gray on Fox Red