Originally Posted by FPenvy

the resonators on the CBE itself do not change the exterior volume much at all. it's a small difference.

the resonators really just are there to mitigate the drone of the exhaust on the inside and eliminate some rasp.

volume comes from the CBE in general, removing the super restrictive stock cats, and then the different tones between the SS and CF muffles.

also the LTH and TPs have different sounds as well.