I made a comparison video for all those who are wondering how the Gibson Axleback 616006 mufflers do sound on a Citadel 2012 V8 model. Mid (suitcase) mufflers wasn't changed at all!
With the Gibson Axleback, you get a really great deep rumble in low to mid rev, but sound is cut off in high rev as with the stock resonators.
Drone is noticeable in idle after start only, but stops about 60s later. Sound level is just right, feels a lot louder than the stock. But you are still able to sneak around here in the EU without getting noticed