Thy this thread from the LLT section:
http://www.camaro5.com/forums/showthread.php?t=33104
It's an exhaust mash-up thread that should probably be duplicated here. I'm fairly sure every exhaust for 2010-11 will work for '12. Be warned though, I watched so many videos trying to decide I got them mixed up. I'm thinking MRT v2 or my local muffler shop for a custom set-up