I finally decided to go with ZZP for their catback kit. Even though the description on the website says may fit 2006+, I chanced it anyway. The fit under the car was good, all the stock hangers lined up the fit is good. The only problem is the width of the tips. I believe the stock LTZ mufflers have offset exit ports the ZZP mufflers are center. So this has the tips completely missing the exhaust cutouts on the bumper.
As far as sound goes, I am happy with the lower tone and not obnoxiously loud sound. In my opinion it's hard to make a V6 truly sound good loud. It's a fine line to walk. But at high rev, 4000-5500 rpm it really opens up into beast mode. Overall I am happy with it, just need to find someone to move the tips out 2-3 inches.
As far as sound goes, I am happy with the lower tone and not obnoxiously loud sound. In my opinion it's hard to make a V6 truly sound good loud. It's a fine line to walk. But at high rev, 4000-5500 rpm it really opens up into beast mode. Overall I am happy with it, just need to find someone to move the tips out 2-3 inches.