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So if I understand you correctly, you turn PSE on/off with the Sport button (in the Sport Chrono Pack) and then you can turn the cut-off on/off with the additional switch ?
sorta, but not exactly.
With the 997 Sport Chrono Package, Porsche has gone back to the methodology from the 986 Sport Exhaust and on the early 2002 996 PSE, which was that there was no driver intervention to turn on the "quiet mode". The mode was switched on and off automatically at certain speeds.
However, it appears that cars WITHOUT the Sport Chrono Package have a manual "quiet mode" switch. This is the switch with the double tailpipe icon. If someone reading this has that switch, can they confirm that it is the manual switch?
Now in reading the Tech Information guide on the 997 PSE, the wiring for the manual switch is in even cars with the Sports Chrono Package, just not connected. Adding the double tailpipe switch for manual control would be very easy to do, if there was a socket in the center console for it.
I would suspect that when the Turbo and the Targa are introduced, that the center console bezel for those cars will have extra slots in it, so that bezel would be the one to get for this mod.
Since the "quiet mode" vacuum switch is just an 12v analog switch, it will be easy to wire in a dash switch to control it, and there will be no danger of disrupting any of the digital circuits that control the rest of the engine or car.
I believe that someone on this board has already done this type of mod, but did not use the factory switch, but rather a regular switch that is hidden in the center storage bin, or someplace like that.