Yeah, it's illegal to install HIDs commercially that's why on most sites it says for "Show Purposes Only" because the only legal HIDs come straight from the factory. Will you get a "fix-it" ticket over it, no (unless you have a **** of a cop).

The best way to install them for me was to leave the retaining clip on the headlight, feed the wires of the bulbs through the clip and then you should be able to angle the bulb-end to get it to fit through the clip and into the housing.

It might sound confusing now, but doing what I said above will cut a lot of time out of installing time. 5 minutes compared to the 30 min trying to force the retaining clip back on with the bulb in the housing.

Also, go with the 4,200K output. Most, if not all OEM vehicles with HIDs are 4,200K. 6K isn't that blue on the road and the output is still better than halogens, I'd just like it to look more white than blue. There will still be a tinge of blue on the exterior depending on the angle at which you look at it.