Hi Mike,
This exhaust can have its valves closed by the original PSE button on your dash. It was easily installed by me at home and I just followed the Flat 6 992 exhaust install video.
My Turbo S had PSE as well. I had zero drone and it opens up the sound when RPMs go up. Doesn't shake the neighborhood at idle or low RPM.
Exhaust install video :
Let me know if you have any other questions. My cell is 469-877-3570