depending on what you are looking for, depends on what you choose. If you are just talking about using the stock housings use the 9007 bulb.
If you get the dual hi/lo kit, it will come with the wiring harness, so you don't need to get it. The dual means the hi and low beams are HID. This is what I have and I didn't get an eliminator.
If you get the single kit, the low will be HID and the hi will be halogen (regular bulb kind, just like you have now). You would then need to add on the harness for $15.
*note* With the dual hi/lo HID bulb, the bulb has a magnet in it to move the filiment inside to change it to get a different point in the housing... bottom line is that the hi beams are worthless and I always keep them on lo. Also, I was parked next to a friends G8 GT and he couldn't get his hi or lo beams to overpower mine. I also drove 2000 miles from Colorado to Alabama and never wished I had a hi beam. Yes, I did drive at night.
Read this thread for more info http://www.grandprixforums.net/f11/u...tml#post388548
good kit, I'd recommend it. I have the 35W 5000K color as I hate the 6000k blue color.
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