I'm going to get the GM CAI just because it looks so damn cool!! The Cat Back... not so much. It's nice to see that length of straight pipe though, that let's me know there's a good spot to put chambered resonators/mufflers if GMMG doesn't make a Chambered Cat Back for the 5th Gen.
BTW, TAG... have you heard anything about a GMMG setup? I remember reading something about you having something pending with them and Tom Henry. I emailed them a few weeks back and asked if they had plans for pipes for the 5th gen but never got a response.