I believe Borla finally offered the ATAK in a CB for the 6.2, previously they had not so I'd double check on that. I'm sure someone can correct me if I'm wrong, they probably do by now.
I had a custom setup made for me with the ATAK muffler and it sounds great. I will say the ATAK is LOUD, so that better be what you want otherwise I'd suggest the S-Type or you could go with the XS but to me those are barely louder than stock. Borla does come with a little drone, some people will say a lot, some will say not really, it seems to vary. If you get a CB though the drone should not really be an issue.
I have never had Corsa on my truck, but if comparing my truck setup to Corsa on the vette, the Corsa is little quieter overall but a lot quieter on highway.