Center Muffler/x piping?

Anyone do anything similar? Plan on getting this done and possibly rear mufflers replaced as I'm looking for something cheap to make my car a little louder without causing me to fail e checks or anything. Planned on getting a ecs tuning x pipe in place of the mid muffler but if anyone else has any cheaper recommendations or anything like that please let me know, Audi a6 3.0 c7