I found a quick and dirty (and cheap) way to implement DRLs on my 99 Carrera. I noticed that forward fog lamps were implemented by pulling the light switch out one notch. Normally, you would do this with the headlamp switch in the the headlamp on position. In my case, the switch can be pulled out in the off position, although it springs right back again. I bought a 1-7/8" O-ring at my hardware store and slipped it under the switch to keep it in the pulled-out position at all times. The effect is to implement DRLs - the forward fog lamps turn on with the ignition switch and stay on all the time, and they don't blind approaching drivers at night. Not sure how many models this will work with. I checked a friend's 2005 Carrera and the switch can't be pulled out in the off position.
