Looking to make my exhaust system correct and want to add resonators. I have 3" pipes and standard mufflers and it all works great but will admit the exhaust volume and "hum" inside the car will make the ears ring so want to install resonators and possibly a smooth sounding muffler. Who sells resonators? Any recommendations to a quality muffler that is a good fit to a Challenger? I really don't need pipes just want to make the system correct and tone down the interior noise. Engine is a 440/6, 727 trans, 3:23 gears. As always thanks!