i just bought an 03 gli vr6 (i'm new to vw, and this forum). i couldn't find in the book if after market cat-back exhausts void the factory warranty. i want to get in on the group buy for the new GHL xhaust, but i have a feeling this is going to void my warranty. and i also wanted to know the same thing for cold-air kits. i havent even driven this sucker yet, so i don't want to throw away my warranty just yet. thanks, i look forward to learning a lot about my new car here.