1: Should have gone with VVME
2: You do not NEED a relay harness. You'll be just fine without. Plus, you need one harness if you do get one, not two.
3: You do not need to disable the DRL's, but most of us do because there's no point in having your headlights on in the middle of the day. For 97-03 cars, you just remove the DRL fuse. Not sure about 04+
4: For 97-03 Grand Prix's you need 880's for the fog lights. For 04+ you need 898, I THINK.
http://www.grandprixforums.net/insta...rix-29325.html