Check out the Supersprint Megaphone exhaust for the Porsche 992.2 GT3 Touring.
It bolts right on to the stock headers / cat / gpf assembly, and it comes with valve simulators, exhaust gas pressure probes for a CEL free operation.
The sound is amazing when blipping the gas pedal at 4000, in neutral.
It becomes phenomenal when driving wide open all the way to redline.