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To have a dual mode exhaust, you'd probably need all the electronics that go with it as well as either finding somebody technical enough to get it recognized by the head unit so you could control it in the settings or else possibly even need to swap the head unit entirely. Because of how tightly integrated it is with the car, you'd be paying 10x what it would have cost to just add it to the build sheet at the time of ordering. All aftermarket dual mode exhaust systems, like the one Borla makes, also ride off the same controllers that the stock dual mode exhaust uses.
Ie: If you didn't order it this way, you can't make it this way in retrospect. Sort of like trying to swap an automatic transmission for a manual. Much cheaper just to trade it in.
Maybe one day somebody will create an aftermarket solution, but a one-off solution will be expensive as hell. Even for basic IC board development, you need to sell a lot of volume to offset the R&D costs.
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