Do you mean the additional extension harness?
Or like the whole igniter and ballast?
I think you mean the additional wish you wont need for are cars.
Ive installed 5 of these kits and you only need what comes in the standard kit.
What did you go with? 35w or 55w 6k or 8k i have 6 and want to switch to 5k
Oh alright thanks..I was talking about the additional..But I will be sure to post pics of them when I get the time to install them. I went with the 10k since I have the midnight blue g6 and thought they would be a great combo
To install the low beams or high beams, you will have to drill a hole in the dust cover and it is plug and play. The only reason you would need a wiring harness is if you trying to put a 55w HID into the low beams or fogs since they are only wired for 35w.
The fog lights are plug and play with no modifications. You just need a place to strap the kit so it doesn't sling around when you are driving.