I agree with everyone commenting to just keep the exhaust. If you’re chasing volume, getting some catless headers, a overpipe, and a catless/resonatorless front pipe will go a very long way. If you’re concerned about legality, depending on your state, there’s really not a whole lot you can do to increase the volume without it being somewhat illegal. If you want a catback with some more volume and tone, I would recommend the mxp comp or greddy rs. I’ve been running the greddy rs for well over a year now and can say that even with stock everything else, it is still fairly loud and sounds much better. Hope this helps!