I suggest you try and find examples of all, and pick it based on what you like.
I have heard Corsa (both touring, and sport) on C6, and I had Borla on one of my past cars. I have not heard Borla on a C6 yet. Im still deciding on which I will get. Im leaning toward Touring Corsa atm though. I heard sport and touring side by side, and liked the touring more. Still, I have not heard any Borla, so Im still outside. A TON of people love the Corsa Sport, so don't listen to me, listen to the actual cars, and decide for yourself.
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