I'm possibly interested. I've got some questions for you about the tips but I can't send PM's yet, damn newbie status. I've got the same red 08 Denali XL that you have in your picture.
Where you located at? Why you selling them? Notice any performance gains, or just a better sound? Any drowning inside the truck? Did you replace your muffler too, or just the tip delete? How difficult was the installation?