The only car I ever had with resonators was a Jaguar. (It had dual exhaust with 2 mufflers, 2 resonators, 2 exhaust tips. It cost $800 to replace the exhaust system and that was years ago.) In that system the resonators came after the muffler. On our cars you can control the sound to some degree with an exhaust tip. They even make exhaust tips that are sound adjustable. Type in exhaust tip on ebay and you will see all different kinds. I don't know about Ractive, but most companies make mufflers in different degrees of sound. For instance a Flowmaster 50 series is quieter than a 40 series.