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If you want an over axle exhaust system that will net HP and TQ with no drone, go with Corsa Sports. My cutouts that were installed when I had factory mufflers are not good for any HP gains after installing the Sports.
I used to get 8 HP from them......
If you don't like that slight miss that most C6's have at idle, install a oil catch can. I have installed 4 now and all 4 cars idle smooth as glass, even my 465 RWHP LPE GT11 car. Guess that the engine does not like that small vac leak.
I am curious about the connection of the catch can to the rough idle. I thought rough idle was caused by cam lope which is a slight overlap of intake and exhaust valves opening when the car is running ? I'd be interested in putting in a catch can if t really did smooth out the idle.