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My 2018 1SS didn't have NPP either - I lucked out and got the OEM NPP muffler and found a dual tip rear diffuser - all in it was less than $200
It's always in bypass (fused pull) mode since I can't control the NPP but I can't imagine ever wanting to closing the valves!
Of course my fiance has a different opinion of it LOL
Oddly, I had started the car when there was no muffler on it out of curiousity - it sounded terrible compared to the by-pass NPP muffler sound
Either way - I have no regrets going this route and would definitely recommend it
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