Contact Chuck at Corvettes of Westchester. He knows his stuff. He tuned my C6 Vette and my 2012 SS.
My SS has an Airaid intake and no other mods. Chuck tunes your car using the EFI Live Auto Cal. After installing the initial tune, you put the Auto Cal into data logging mode. After e-mailing the logged data to Chuck, he'll analyze it, adjust the tune, and e-mail the tweaked tune to you. This process is repeated until he thinks it's where it should be. He'll service the tune for life. As you make further mods, he'll tweak the tune.
He was recently at the C5/C6 Bash at the Corvette Museum. I contacted him about tweaking my tune and he worked me in. He was very busy, but took several hours fine-tuning my car. When he's tuning at an event such as this, he uses an exhaust sniffer to further refine the tune.
My car starts better, runs better, and the tranny behaves a lot better. (It's an auto.) I intend to put a cat-back system on it next year. Once I do, Chuck will adjust the tune for it.
Corvettes of Westchester
I agree that the car needs to breathe better. It was obvious to me while he was working on my car's tune that it would greatly benefit from the addition of free-flowing exhaust.