Welcome aboard, your gonna love your new ride. Honestly I have yet to see an aftermarket muffler that doesn't pump up the volume quite a bit. Two sources, Drummer and Special Ops, modify the stock muffler and would probably be willing to just make it dual tip without getting any louder but I doubt you would be able to call it a performance muffler. Go here to see a shoot-out of most of the available exhausts including dB levels. I found this cool pic of what goes on inside the stock can with the interactive exhaust valve.