You can buy the OEM fogs for $200 or so on eBay and it comes with a switch replacement and all wiring. These ones are not OEM, but they're basically same thing. My kit was only $160 on eBay and I like it because they have a separate switch that has an on/off so I can run the fogs with my brights on (can't do that on oem without messing with wiring).
Haven't installed yet but seems simple enough. 2 wires for each HID, going into a harness that connects to battery power and ground, with another connector to plug into the switch they give you. The switch looks like it can be mounted on my dash with double sided tape. I will probably mount it right next to the stock switch.
The oem ones replace the stock switch, I've used these guys fogs./hids on my Audi and GTI in the past for years and loved them- and didn't have to buy hids or yellow lenses it all came with it
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