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I spoke with Corsa USA today and they (he) confirmed they are coming out with a 3" system for C6. Probably available late February. I think I'll wait till then.
No drone is pretty much their corporate battle cry and I would be very surprised if it had any. I have the sports now and can confirm no perceptible drone to my ears with that system. As an aside in general when diameter increases so does sound volume. It makes sense that corsa MIGHT position these as being (a little?) louder than the current sport system. When I inquired they said they were not ready to comment on the systems relative volume compared to the sports.