A few people have installed HID systems in their DSM. These systems are often installed in place of the factory fog light system, rather than as a headlight replacement system. There is at least one person that is selling HID conversion headlight systems for 1G DSMs, however.
Current information seems to indicate that some of the HID kits are not worth the cost. Some owners have complained that the HID kit was "worse than stock". Research carefully before buying.