Selective loud / quiet exhausts . . . Anyone tried one?

So it seems I have a loose baffle in one of my Rear mufflers. They are a cheap aftermarket muffler - the rest of my exhaust is stock. I would like a bit more noise and love the sound of the jhm style pipes. There’s no way I can really get one out my way (New Zealand) as the postage would be half the price of the pipes. . . .

I also drive mine as a daily so don’t want it stupid loud - anyone built an adjustable exhaust sim with flapper valves for loud and less loud? Thinking if I can hook it to the transmission / ecu so that it switches when you go from D to S would be prefect!