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I saw that SuperSprint has what looks like mufflers (as opposed to a full exhaust) available for the 958.2 Cayenne S/GTS. Given the VERY limited exhaust options for the car, it's something to consider.
And here's a video of it paired with the Fabspeed bypass tubes. Sounds like 1st sample is the stock exhaust (PSE maybe) and the 2nd sample is with the Fabspeed/SuperSprint Setup.