I got a 35w HID kit from DDM Tuning, had to come from Japan, but the difference was amazing.
You have to be careful when wiring them up, some cars + and - are reversed at the harness, so you have to plug the harness into the ballast backwards.
Also I do not recommend their error eliminator, because if you are unsure whether or not your harness + and - are reversed, and you plug it in wrong, then it can explode!
I am lucky my hood was down when mine exploded, it sounded like a shotgun going off, scared me quite a bit, I can see it putting an eye out or worse.
Without it my panel that shows all lights would show a red light like the headlights were out, but they weren't.
Also with the 35W kit you do not need the wiring harness/relay, just the ballast mounting brackets..
It looks like they have a Cali Distributor now...
NOTE: They are quite bright, and without the proper focused HID lighting headlamp housing, you will possibly blind others, I only drive at night in areas where not a lot of people travel, so I was not too concerned..
Be careful with those if the bulbs are not securely in the light sockets, they get really hot, and could easily melt that plastic, and maybe cause a fire.