Trying to Eliminate Drone. Need Another Opinion.

Krooser said
Ditch those fancy-schmanzy chambered mufflers and install some simple glass packs. Cheap and effective... I've had them on almost every cool car I've owned for the past 50 years. No drone ever.

Try Porter Mufflers...

Around hear we call FlowMasters "Drone Masters....

I don’t know what a ported muffler is. Never heard of that one.
Also, glass packed mufflers are a tasters choice. If you like it, then it is for you. I’d rather never heard that noise from f them by themselves. I’d love to never hear them ever again. IMO, that’s the sound of cheap *** coming! NOT power coming.
For sound enhancement or to help tone down, fine.

69_340_GTS said
Ford's factory "fix" on a lot of late-model Mustangs was to use two different length mufflers.

I would conclude that this also means that two different design mufflers (1 chambered, 1 not, for example), might help as well.

Know for sure and do not jump to conclusions because that is “Assume” which can be bad. I am not saying your wrong though because we I do not know! ;)
I just find it hard to think the factory would use a glass pack muffler.