ss2z06

I have a 10 zr1 and my mods are in my sig. MY question is what are people doing to not get black flagged on road courses for being to high on the db level? I have the stock mufflers and when the flaps open I exceed the db levels. My local tracks are laguna (joke, not even trying), sonoma (similar to laguna), and thunder hill. Thunder hill is 103. I disconnected the flaps and kept them closed. I didn't even think about the repercussions at the time. I melted a lot of items in the back of the car from the heat build up and hopefully didn't create any issues with the engine. What are others doing? All aftermarket mufflers that I know of are louder. Other than putting back to stock I don't see a solution. On a separate note does anyone know where i can purchase the diaphragm on the stock mufflers on its own? GM doesn't sell individually.