To answer your question...
If you have the separate beams you will have to purchase two HID kits. The Bi-Xenon kit is used for headlight systems that contain both the low and high beams in the same bulb like the 9003/9004/9007 (there may be more).
Take my daily for example. I have a 07' Trailblazer SS that I drive to and from work. It has separate low/high beam set up. I would have to order a 9006 HID kit for the low beam, and a 9005 HID kit for the high beam set-up. Now the way the truck works is that when you are driving with low beams and want to switch the high beams it turns the low beams off and runs strictly the high beams. Some vehicles do this, some don't. Some vehicles run both lows and highs, when the high beams are selected.
In YOUR case, you would have to run two harness kits, one for the low beam kit and one for the high beam kit. If I were in your shoes I would run your low beams on a relay set-up and run your high beams directly plugged into the vehicle harness with no relay kit. The reason I say that is because you probably barely use your high beams and it doesn't really warranty a harness kit in that sense. Personally I don't run high beams on any of my vehicles because I really just never use them. I live in the city limits and do most of my driving there. Plus flashing high beam HID's is kind of pointless because they have to be on and fully warmed up to be their brightest, whilst incandescent bulbs react quicker.
That's completely your choice though. HID's aren't really complicated BUT there is a lot of information and options to consider when deciding, correctly, what is best for your needs. I hope this answers your question, let me know if you have anymore.
ALSO - I wanted to comment on the city lights most of the conversion housings come with, if you want to use them you are going to come into some trouble with putting the headlight into the car. It might be different with separate low's/high's but if memory serves me correctly I have to notch my headlight buckets to clear the bulb and harness because it wouldn't allow the light itself to sit back in the bucket all the way. People normally just take them out and cover the hole with electrical tape. The city lights don't come pre-wired either, so you will have to tap into an existing power source. I gotta say though they do look good with LED lights that give off 180* of light.
If you have the separate beams you will have to purchase two HID kits. The Bi-Xenon kit is used for headlight systems that contain both the low and high beams in the same bulb like the 9003/9004/9007 (there may be more).
Take my daily for example. I have a 07' Trailblazer SS that I drive to and from work. It has separate low/high beam set up. I would have to order a 9006 HID kit for the low beam, and a 9005 HID kit for the high beam set-up. Now the way the truck works is that when you are driving with low beams and want to switch the high beams it turns the low beams off and runs strictly the high beams. Some vehicles do this, some don't. Some vehicles run both lows and highs, when the high beams are selected.
In YOUR case, you would have to run two harness kits, one for the low beam kit and one for the high beam kit. If I were in your shoes I would run your low beams on a relay set-up and run your high beams directly plugged into the vehicle harness with no relay kit. The reason I say that is because you probably barely use your high beams and it doesn't really warranty a harness kit in that sense. Personally I don't run high beams on any of my vehicles because I really just never use them. I live in the city limits and do most of my driving there. Plus flashing high beam HID's is kind of pointless because they have to be on and fully warmed up to be their brightest, whilst incandescent bulbs react quicker.
That's completely your choice though. HID's aren't really complicated BUT there is a lot of information and options to consider when deciding, correctly, what is best for your needs. I hope this answers your question, let me know if you have anymore.
ALSO - I wanted to comment on the city lights most of the conversion housings come with, if you want to use them you are going to come into some trouble with putting the headlight into the car. It might be different with separate low's/high's but if memory serves me correctly I have to notch my headlight buckets to clear the bulb and harness because it wouldn't allow the light itself to sit back in the bucket all the way. People normally just take them out and cover the hole with electrical tape. The city lights don't come pre-wired either, so you will have to tap into an existing power source. I gotta say though they do look good with LED lights that give off 180* of light.