We now have HID Bulb replacement in various bulb intensities ranging from 6k, 8k, and 10k.

Below is a reference photo courtesy of Altspace for a before and after shot using 6k intensity bulbs.

http://i118.photobucket.com/albums/o113/BluMonstrRX8/d2sbig.jpg
http://i118.photobucket.com/albums/o113/BluMonstrRX8/hid_before.jpg
http://i118.photobucket.com/albums/o113/BluMonstrRX8/hid_after.jpg

Orders can be placed on the site and are in stock and ready to ship.

http://raceroots.com/index.php/products/mazda/rx8/interior/rx8-hid-bulb-oem-replacement.html