here you go,,, for this was an old video, but the application is the same.
STERLIN F1,,, they make nice stuff,,,, bolt on at flanges. It's basically a controlled bypass style. // https://www.youtube.com/watch?v=PpNWxdRY7Ho // price point I've seen from $1,400 to $2,000. They wholesale out these units and they are available for the 2014 model year Cadenza. On the drivers side in the switch pod there is a blank there that would be perfect for the normal / sports toggle. You should be able to find a switch that is similar or order an OEM blank, with RED LED.
This car is very easy to get a custom exhaust made for as there is no need for decorative tips. For $500 to $700 a custom cat back can be fit. After the cat is a huge resonator that needs to be replaced with a higher flow version and then any two mufflers you want fitted after that.