Originally Posted by papasmurf

Yep. Depending on bulb manufacturer, they'll start going bluer, then shift into purple, then pink if you haven't gotten fed up at that point, or will simply go dim. 2000-2002 or 2003 have Osram bulbs, which color shift like above. Phillips bulbs simply dim out from what I've been told.

Cimbro, hit up ebay, OEMPlus or somewhere else where you can get Phillips D2S bulbs (part number 85122, or if you don't mind a yellower bulb, 85122+ is a couple hundred lumens brighter) and swap them out. It takes about 45 minutes and you will see a difference. I swapped them in my 02 for new ones and the light is noticeably brighter.