My Magnaflow is also a lot louder than I expected or wanted. Between ~1500 and 2500 rpms, it’s really annoying, and I had already installed sound deadening in the entire interior to hear my stereo better.
I have also considered adding another small muffler or a resonator to my system to get the sound level down.
The Ultra-quiet resonator in my signature helped a bit with my Magnaflow cat-back. I have the street series fwiw.
I installed it just in front of the muffler.
If you want to eliminate specific frequencies, you can get a 1/4 wave resonator designed to target the worst offending frequencies.
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