Had HID bulbs in my stock low beam and fogs on my 2002 and the light output wasn't very good. Scattered light output without much distance. This was with a basic HID kit and 6000k bulbs. It looked cool cosmetically speaking, but from a utility standpoint, the results weren't that good. After I performed the 2006/07 front end grille/headlight update, the light output is MUCH better. I get better light distribution and more distance with the same HID's. The fogs weren't changed so the improvement is attributed to the headlight housing only. Like others have said, proper HID retrofitting into the stock housing is best. Simply replacing the halogen bulbs with plug and play HID's won't net you much gain, at least not on the older (98-02) light housings.