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I just upgraded my 05 C6 widebody's exhaust to add a Z exhaust manifold and long tube X midpipes. I am also adding the 3" Z Corsa exhausts to the system. If you opt to keep the stock c6 (2 1/2"_ mufflers, you will run into trouble. The Z's long tube mid pipes ends aren't flared outwards enough toward the rear wheels to mate up with the stock mufflers. It can be done, but not without alot of bending and welding.
I chose to keep it looking good instead of a butcher job.