There is a TON of info on HID lighting on places like HIDPlanet.com to learn from. Improving your lights isn't going to be cheap OR easy if not made that way at the factory. If it was there would be more OEM HIDs out there on cars. And you will even get some folks that want to argue that HIDs are no better. For my 52 year old eyes at night I need help and have been spoiled by HIDs on my Porsche.

There are lots of issues and approaches to improving lighting on a car. Here are a few of them:

There are "kits" where HID bulbs are modified (rebased is the term) to fit in another style bulb holder (H1, etc.), and then generic HID ballasts used to power the lamps. You reuse the halogen projector and 12v wiring already in the car. These are what you find on eBay at lower prices.

A step "up" in kits is to get one with OEM brand/quality bulbs (Phillips, OSRAM) and ballasts/ignitors (Denso, Phillips and others).

Next step up in kit projects is to pull new heavier gauge wire from the battery (yes it's in the trunk for us!) to power the ballasts and use the original headlight wiring just to power a relay.

The other whole approach is to do a "retrofit" project using bulbs and projectors from an OEM HID car. This is the closest to getting a lighting system done the way Toyota would have done it OEM. It is not an easy do-it-yourself project and takes some time and fabrication skills.

I have chosen to do the retrofit route over kits -- just my choice. I have two headlamp units from wrecked TCHs ($120 for both) and all the HID parts from a Lexus RX330 ($200). It is taking time but going well as Toyota used very similar size and design projectors in both applications. I have pulled two new 14g wires from the battery up to the engine compartment and will use the stock lamp wires to close a pair of Bosch relays.

Good luck with your choices and project!!