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Akrapovic makes a controller that should work just fine to "intercept" the control signals and control the NPP exhaust (on a non-NPP car) just like the factory NPP setup. Here's a link: https://www.akrapovic.com/#!/car/pro...37&yearId=4241.
Not cheap, but the controller and a used NPP exhaust should still be lower cost than an aftermarket exhaust.
Ernie
I had this controller installed on mine and it works just like the factory NPP system with the integration.
I purchased used NPP from forum member 2 years ago, installed by Midas (no hassle) and am happy with no control. Considering "fix" shown on forum which allows partial closing (not variable) with 1 1/2" angle bracket ($5.00). Different sizes would allow different % of closing and could be easily changed for long trips, etc.