Congrats on your new car. If you're doing HID fogs, then both headlights and fogs will require ballasts. You can do 55W lows, but not many people do them because of the extra heat and a good chance of flaring. Most people do 35W. The fogs will only handle 35W because of the heat generated by the bulb. If you want a crisp white with a hint of blue, look for a 5000K or 6000K bulb temp. A lot of OEM HIDs are 4300K, so they are more of a pure white with a tiny hint of yellow. Not as yellow as a halogen though. If you go beyond 6000K, the color starts getting into the violet range and you have a greater chance of being stopped by police and harrassment by me because 8000K is rice.
Some people will also install a relay with the fogs to help offset the initial power demand. I've never used one, probably never will. I've never had problems with not having relays.
Search around for HID suppliers and post what you find. If you find a kit for $100 and it's a smokin deal, let us know before you buy. You can find kits for as low as $40-60.
Good luck!
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