I have a '17 Turbo with the base (non sport) exhaust system. At 42K miles, the exhaust makes a loud banging metallic sound on startup, which sound goes away after warm up. My initial diagnosis was a loose baffle or cat that tightens with heat expansion. Close, but not quite. My base mufflers have butterfly valves on the inboard pipes. It does nothing on the base muffler, being open all the time, and not connected to anything. In my case the butterfly valve seems loose. I have a service appointment at an indy shop; and my guess is that the "fix" will be to spot weld the shaft of valve in its open position.

These exhaust butterfly valves exist only on the inboard ports. This means that under normal operation exhaust gases flow through both ports. On the sport mufflers the valve is actuated by a vacuum-operated rod that closes the valve, routing 100% of exhaust through the less restrictive part of the muffler - hence more sound. More power? Probably because there is more gas flow when the valve is open. I think all this was an intentional design feature by Porsche to simplify production. All Turbo mufflers have this muffler valve. Perhaps other models do.

I am satisfied with the sound/performance of the stock base muffler. BUT, were I so interested in the sound of the sport I think it would be fairly simple to convert my mufflers.
You need some sort of "motor" that activates a rod that opens/closed the valve. Porsche uses a vacuum motor, which I do not like. Any vacuum-operated device is subject to aging leaks. Better, I think, to use an electric solonoid instead. I would "kit-bash" the controls from an after-market exhaust cutout system that has a remote wireless control pod.
Here is a UTube video that illustrates an electrical cutout with remote control.