[6ixSpd]

Update: just installed a Vibrant 1141 resonator on the car to reduce the drone. It's certainly cut the drone out to the point of where it was prior to headers. The rasp has been toned down quite a bit too. Still pops and crackles lol.
Current setup: Roundelwerk headers > secondary cats > y-pipe > Vibrant 1141 resonator > Magnaflow 13266 muffler.

I'm going to evaluate this configuration for a few days and see if I want to reduce the drone even further. At that point I would likely swap the muffler back to stock and remove the Vibrant resonator as well to keep it a bit more free flowing.