I'm running the DDM slim ballast 35W 9006 6000k HID kits for both my BMWs.
There are no modifications necessary to install the 9006 HID bulbs into the fogs. The 5000k bulbs are more white than the OE (4300k) bulbs. More of a whitish-yellow color but more on the white side.
No need to purchase error eliminators for fogs. I don't have them. No mounting brackets either. 3M double sided tape is all I used. I did route a seperate wiring harness for my fogs however. I recommend doing this :thumbsup
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