what does an exhaust resonator do
Report Abuse. The resonator is used to provide the sound the maker of the car wants as well as helping performance in a specific RPM range. So by removing it, you may get the sound you want at the expense of performance. The exhaust system on a car can be tuned just like the pipes of a organ.It has to do with resonance, volume and length. It is one of many details that auto engineers make big bucks figuring out. like loud. Anyways there is a long resonator right after my catalytic converter. My friend says it's for both noise and emission... show more I'm redoing my exhaust system for my 1996 Mazda MX-6. I just want to make it a straight pipe with a glass pack (to tone it) instead of muffler to make it sound loud.