I'm still waiting on the kit from Flowmaster. They said that they ended up designing a new muffler for the v6 Camaro and it would be available as part of an axle back kit sometime around Oct. 1st. Guess we'll see how it sounds once it comes out.
If I don't like the sound or price of the Flowmaster, I'll probably just go with this (almost cat-back) Magnaflow setup:
http://www.camaro5.com/forums/showthread.php?p=779799