I just bought a new 2008 Sierra Denali 2wd black on black, w/ nav, DVD, 20s, and the 6.2. This truck is awesome but it needs a new exhaust system. At the very least it needs a new tip (if you've seen one you know what I'm talking about). I was wondering if anybody had any experience with any of the exhaust systems that are out there. The only one that I am aware of is the Corsa and it's pretty expensive. Let me know what you guys think.