Here's some pics of the lo-beam DDM HID kit installed on my '03 B12.....
Ballast mounted on fairing frame-stay-thingy...
Another angle of the ballast. It's held on with double-sided tape and a long heavy-duty cable tie. It doesn't budge.
And the light output.... hard to tell from this pic, but it lights like a prison yard after a jailbreak...
I just went with the lo-beam since I didn't want to have to try and mount 2 ballasts, and combined with a normal hi-beam halogen, it's more than enough light on dark country roads. But adding a hi-beam HID isn't that difficult either if you wanted to go that route. It's a simple plug-n-play kit, no extra wiring or anything needed.
Also, I went with the recommended 35w HID, color 5000k (pure white) Some people think they need the 55w kit, but it's not necessary and I think the 35w is better for less heat and less "wiring stress"