What can I do to my Tl without affecting my warranty?

 

What do you want to do? Power? Handling? Appearance?

 

Well, window tint, spoiler, wood kit. Those things will not void your warranty. I believe even if you add comptech stuff to your TL it won't void your warranty. And unless dealer can proves that the aftermarket stuff that you put on did cause your problem.

 

I don't think stickers will void your warranty either.